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While a bot might try to follow it (because it is, in it simplest form, a type of link), that will not in any way adversely affect you.  That tel: in the tag will tip them off that it is a telephone number and/or should be click-to-call. So no link equity will be lost, you won't start seeing tons of 404 warnings, or anything of that sort.

You could but its not completely necessary to go through all those sub-pages to 410 them. While a 410 Gone response is a stronger signal, those pages serving 404s will eventually be removed from the crawl and/or SERPs by the bots anyway. So if those pages are just dynamically-generated flak, and don't provide anything of benefit, then leave them as 404s and don't worry about it.

Pro has 5, Pro Plus has 12, and Pro Elite has 30 campaigns. Only active campaigns count towards that cap, not ones that have been archived.

Are the categories helpful for the customer? On one hand you don't want to lump too many things into one category when they can be broken out into more granular categories that better serve visitors. On the other hand, it won't help you or your customers if you get too granular and break everything out into categories based on the mot insignificant details.

While keyword cannibalization is a concern, serving your visitors/customers what they want and how they prefer to see it will likely improve metrics more on your site than concerning yourself with a nebulous concept like "how many categories is too many." If you have 200 different categories but they are well targeted and you want to add another (or ten more) that are also equally well targeted, then why wouldn't you do it?

My first thought would be how many sites & who's paying? For $199 a month you get the Pro Plus subscription with 12 campaigns. So it would be more cost effective to have your one account with 12 campaigns (even if you're only using 6) than to have 6 accounts (costing $594 a month total) with one site on each... Unless your clients want more control over their information and would prefer their own individual accounts that they pay for and give you access to in order to do your work. Have you spoken to your clients to see how they feel about it and what they would prefer?

(Though technically it is against the Terms of Service to to authorize others to use their account, profile, or messages.)

A Canonical is kind of like a Bots-Only 301 redirect. So, from a purely mechanical perspective, using a canonical can pass link equity to your other page without redirecting Users off of the forum thread. Now, this would be a deceptive use of the Rel=canonical tag and the bots would stop respecting it on those pages. Since a canonical is a suggestion, not a directive, if the bots think that your canonical is improper, deceptive, incorrect, etc. then they can just stop following it. Ultimately, using a canonical tag in the manner you're thinking wouldn't work out the way you would want it to. You might be able to pass equity from the one page to the other for a time... but that would not be a proper or best practices use of the tag and it would not have long term effects.

You'd be better served by looking at updating/expanding your content, internal linking, and backlink profile. And take a look at the article that Andy linked to in his response.

A billing invoice? If you click the symbol in the upper right that looks like a Head with some lines next to it you will see a dropdown. Click on "Billing & Subscription". On that page you'll see a tab for Billing Information. Scroll down and there will be an Invoice History list with view links next to each invoice. You can then print those pages.

As to the third part of your question... there can often appear to be a correlation between some of those offerings and improved site metrics which could be signals for improving organic rankings. But there is no definitive cause and effect that I can point to that would say "yes, always put these in" or "no, they never work." More specifically, having legitimate and useful reviews can help improve user engagement and can help to improve conversion rate. Having a decent amount of reviews can also allow you to add schema markup to the page that can add star ratings into your organic results which could improve your CTR. Will it always do this? No, but it can.

Videos are also a good way to improve user engagement, if its a decent and relevant video. Especially useful if people like it enough to share it either because its incredibly informative on the relevant subject or really amusing. This increase in time on page, lowered bounce rate, shares, etc. could improve organic rankings but there is not always definitive proof that this is the case. Videos can have the opposite issue as well... sometimes they just want their question answered or the information presented to them instead of sitting through your 2 minute video about the product offerings or how to install it.

Good images is just good business and so are good descriptions. Having relevant images on your page can also help you take up real estate in image search as well as generic organic SERPs. Having an informative description can help with a variety of ranking signals. But you need to make sure that you are not going overboard, stuffing keywords, or attempting to game the system. For some people, adding 5 images with great, informative descriptions could be helpful. For others it could be 10 images. But for some, those 10 images could wind up inadvertently hurting them if they don't things according to best practices.

Highlighting relevant blog posts? Well, that could help with retention on site as people are more likely to find the information that they need quicker and easier. Promoting flow through your site to the right information is a plus to UX which would make people more likely to come back to your site or to suggest this site to other people. It could also help with the flow of link equity to relevant pages that would then benefit from the infusion and possibly rank better. Or if overdone, or not done properly, it could have no effect, little effect, or the opposite effect as you clutter the page with extraneous links or dilute equity by pointing links at irrelevant pages.

Email subscriptions. This won't necessarily have any sort of organic impact but can help in the retention of users who are then slightly more likely to return as direct visits.

If you're looking for a magic bullet to increase your rankings via user engagement, there is no such thing. There are things to consider best practices and things that work for the right types of sites and things that work well if done properly.

So, I've been away from the SEO world for a few years but now I'm back in full swing and I noticed I have enough points for "A special MozPoints t-shirt and a Roger vinyl figurine" but had never gotten those because I assume it must have become an added swag during my hiatus... but I'd absolutely love to get hold of that as my boss is a big Roger fanboy and it would be hilarious to have that on my desk as a friendly mocking.

If I can't, I can't. But I figured it couldn't hurt to ask.

Google makes 500+ changes a year which means a minimum 1.4 changes every day. And the SERPs shuffle practically every day to reflect the changes individual sites & pages have made and the changes & new pages/sites crawled & indexed by the spiders. Then there are the big algorithm changes that happen throughout the year at unknown intervals and page rank updates every few months.

So don't wait for an update because they're happening all the time. Keep working at it, tweaking things, building your profile, building your presence, creating new content, sharing that content, interacting with your customers/fans/patrons/users, and so on.

Just looking at the URL you posted, it looks like an open DIV tag or an incorrectly closed link in the source causing an html encoding issue.

If they are, in fact, breaking guidelines that Google should be penalizing them for then there is always the spam reporting tool. https://www.google.com/webmasters/tools/spamreport (you need to log in/be logged in to webmaster tools in order to use it).

Oh god, I couldn't agree more with you. Infinite Scroll pages/sites just look and feel awful to me from a user standpoint and they detract from sites from an SEO standpoint.

There are numerous factors that could be doing this. Have they been around longer? Do they have any .Gov or .Edu backlinks? Are the tons of links that they have all from relevant sources? Do they have a better array of linking domains than your site does? Do they appear to be driving a lot of referral traffic from social media to their site? Are all those duplicate content pages you see actually created by parameters but canonicalized to the proper pages? Has your site ever been impacted by an algorithmic or manual penalty? Do your links come from relevant sources? Are you over-targeting your pages to keywords at the detriment of user experience? Is the anchor text of your backlinks all hyper-targeted or is the distribution more natural? And 404s aren't necessarily a bad thing if they're relevant 404s.

My suggestion: Write new, great, original content... get new, great, natural links. Don't do shoddy linkbuilding that will hurt future great posts.

You're fine. The 301 redirect will pass link equity to the .COM so you don't need to go crazy getting everyone to "fix" their links.

I didn't mean to sound harsh or critical... so please don't take it that way. I've been in the situation of destroying my own stuff thanks to bad advice and bad links before... so I know how hard it can be.

In your case, I don't think the 301 is necessary. Like Dana said, it could just be fluctuations and over the coming weeks, months, etc. that article could wind up getting more link love and ranking better again.

Great, original content will garner new links to your site & articles. Work on creating new content and keeping things fresh so you're a resource to your customers, fans, industry, etc. and the good vibes will flow (hopefully). Anything vaguely unnatural with link building nowadays has the potential to turn around and bite you. So when you have a great article that is doing well and drawing in the readers and the rankings start to slip... give it some time, see if its just natural fluctuations, do some testing, etc. so you can do even better with the next one.

Looking forward to the more active and robust presence on the Public Q&A.

This happens far more frequently than you probably assumed. I do however find it amusing that one search will return my page with the correct title and then a similar search will return my page with an altered title. Seems almost silly that a synonym can completely change how my site's information appears in the SERPs... but it happens. On a positive side though, sometimes that may actually help to make you more relevant to a search you didn't think of while not hurting your positions for the terms you're trying to rank for.

First off, have you tried searching for your domain name in all the relevant search engines?

If you're not showing that way, have you tried copying a line of text from one of your pages and searching for that phrase to see if your page appears?

Do all of your pages that should be indexed have the correct meta robots? Its possible maybe they were set to NoIndex.

Have you checked to make sure you didn't accidentally disallow the pages in the robots.txt file?

If you do a site operator search in Google are you seeing a relatively correct number of pages returned?

Have you uploaded a sitemap to Google Webmaster Tools yet? If so, is it old and does it need updating?