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Hutch has the best answer here, it needs to be readable by the users. To add to what he said, it is also important to know that the dynamic URLs can and will be crawled, This can lead to errors, specifically overly dynamic URLs and 404 errors. It is good if you can keep them clean, but that is difficult. I prefer to use static URLs because I can control them and optimize my pages better.

Just enter the URL here. 

You don't need to add a secondary dimension. I just look at my traffic. For example, I had 1627 Google Organic visits last week. 60% were new sessions, or unique visits. That tells me that I should see about 975 clicks for the week in GWT.

I am not sure what is causing the discrepancy. In my opinion the issue isn't with what is in GWT. The update they submitted didn't affect accuracy of data, it was merely implementing the ability to compare data sets over a period of time.

What is your server response error? How about the sitemap warning? I would be interested in seeing if the data in Panguin Tool showed anything weird going on with the update in the middle of February. What Google has indexed vs crawled shouldn't matter to your impressions and clicks.

Usually, I have more data in GWT than in analytics. I would go to Acquisition - Source/Medium and check the amount of unique traffic (not the total sessions, just the new sessions) from Google Organic and compare that to what you see in GWT. They should be more closely related to each other. My numbers never match exactly.

My opinion is that there should be more data in GWT than in GA because "not provided" is not accounted for in GWT. There is no data loss with the updates in GWT in Feb, only a longer lag time between reports.

Has you data always matched prior?

I don't believe so.

Do you have a screen shot you can add by chance? Are you looking at your Source/Medium or are you looking at Channels in Analytics? If you are looking at overall organic traffic in analytics you will see a discrepancy because it will include information from Bing and Yahoo as well.

Remember also that GWT doesn't account for "not provided" searches and usually only count unique clicks.

Above everything, Google looks for your user experience. If you have a ton of 302 redirects you will have duplicate content errors, If you start changing 301 redirects you will eventually create a spider web that is hard to navigate. If you set up your 301 redirects and have to change a few, you should be ok. If you set up 5000 redirects and end up changing 4500 of them or creating duplicate 301 redirects you will eventually have really slow page speeds and bad user experience which Google will recognize and not like.

302 redirects are not common or best practice. I would avoid them all together.

GWT did update their reporting features and has been slow to release it to everyone. There has also been some rumors surfacing on an update the second week of February that really impacted Ecommerce websites. It had a lot to do with responsive websites. Do you use Panguin tool at all? I would start there to see if your drop in traffic has anything to do with some of the updates. If it is just misinformation in GWT, then you should see some things leveling out over the next two weeks. The update isn't complete yet, but lots of people lost days of information.

Are you doing these redirects in the HTAccess file? If so, you should be able to change them at a later date without any issue. A 302 redirect is not going to help you in this situation. Using a 302 will still allow the engines to crawl the old URLs which will lead to duplicate content errors and tons of problems ranking pages in the future.

Whittie is correct, you should be able to go back and edit 301s individually after you dynamically redirect them. It depends on your CMS or Platform how easy that will actually be.

In my opinion it would be a bad trust signal to remove the phone number from this page. If you wanted to do it however, you would just go into the "manage my page" option and delete the number. Here are the instructions.

Again, this is not really best practice, and can have some negative effects. Consistency across the web is important, and I would think it is even more important in any Google Property.

It sounds like there was the option to find similar friends or get friend suggestions. Are you sure the admins didn't reach out to their friends? FaceBook doesn't generally send automated friend requests.

Are you saying you have your NAP in your footer at the bottom of the page or hidden in content below the fold?

In my opinion, you should have your NAP on a contact us page above the fold where a client or potential client can easily access it. Having the information also in the footer of this page isn't harmful. If you want people to contact you then the information should be easily accessible.

I don't know that you need to add permission, can you add a picture of your robots.txt file?

Generally, you want to provide the same experience for all customers. There could be some compatibility issues between browsers, so if you had to do something technical for compatibility that should be ok.

If you have a new mobile site, best practice is to 301 redirect the old site to the new site. If you do that, the value of your links will pass to the new mobile site which will help you maintain your rankings. Laura is correct, what you are proposing is black hat and very risky.

Do you have a Knowledge Base or FAQ section on your site? I would add content like this in one of those places. If you don't have something like this built in, I would recommend using the category pages. This kind of content is great for user experience. My only hesitation would be that more likely than not, most of the content would be below the fold, and it might not get as much view as it would if it had its own page on your site.

Can you split content on your category pages? Maybe show one paragraph above the products and the rest below. Or, if you can add JS to the page, use a script to hide a portion of the content behind a read more button. Ideally, content like this should really have a page all its own. If you can manipulate how content is displayed on the category pages, you should be able to make it work there as well.

Everyone here has some great advice and tips. I tend to disagree with a few of the ideas here. First, I don't think that having links from people that you have built relationships with is a terrible thing. If it is done properly it could probably generate some great referral traffic for you. That is very important. There is no link juice passed if there is no traffic.

You absolutely have to make sure that you watch the anchor text, but you also what to do a quick check of their link profile. As the Penguin updates are becoming more evolved, you can be penalized for just being in a bad link neighborhood. I would just run their domain through Open Site Explorer and see if there is anything that makes you nervous.

If these are sites that are related to yours, and they have the potential to generate good, engaged traffic, I think you don't have too much to worry about.

How are your rankings in Google? Usually a site well optimized and ranking well in Google also does well in Bing. Do you have a Bing Webmaster Tools account? Sometimes Bing rejects sitemaps, you would get a message in your Webmaster Tools account.

No, once you 301 redirect the URLS, Google starts to remove them from their index. So, if you have URLs that are from years and years ago that have been 301 redirected they should no longer be in the Google index. If you don't have a lot of 404 errors then I would make the assumption that the older URLs haven't been crawled or cached or indexed and that the 301 redirects worked properly. I would just add that removing the 301s also removes whatever page value had been "transferred" to your new pages. The link juice especially.