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You should be fine if his version of the content has disappeared before yours goes live. It's fairly normal for content to appear in more than once place over the course of time, so you won't fall into a filter or penalty situation with this, as long as his content has been deindexed. Best to check that it is no longer cached before yours goes live, but it should not take long for Google to drop it.

Hi, Google has no problem with collapsable Div's elements that are crawlable. I mean if the bot can see and read the content in the collapsable div, there is no issue with that. I have used this 100's of times and never had ranking issues + in the text-only version of google cache, i see the whole content. So, use some css + onclick njs function and u're good to go. Here is a sample hidden content in a collapsabel div , that is totally legimate: derniereminute.net  , you can check this screenshot for more details: http://awesomescreenshot.com/08c2ie9rff If you need more help, let me know

Do you know software to check texts for plagiarism? Copyscape or plagscan e.g.? Take "some off that content" from the original source on your site, check this using plagiarism software and take a look at the result... If it indicates, that these parts exist already than it`s DC... The software shows you similarities in percent... if it`s too high then the chances are very good that Google will regard it as DC as well.

Hi Reece, Data for OSE is collected straight through the APIs of the various social services, so whatever they return is what we display. As others have mentioned, metrics are URL specific. For Facebook, we display the activity of the URL you are examining, which is different than the activity around your Facebook page. Hope this helps explain things a bit. Best of luck!

Yes it is best practice. you can read more about it here : https://support.google.com/webmasters/answer/139394?hl=en It might not of been your designer more your CMS system that's create the pages.

A little lower than you have on your image you should see a link page with "your website" and a little tick next to it the tick means its been linked. You can test here - https://support.google.com/plus/answer/3402542?rd=1

This post may also be of help: http://moz.com/blog/how-should-you-handle-expired-content

I support with Yusuf's answer. It picks the count of mentions in the specific URL (homepage), rather than cumulating everything under the domain. I guess, MOZ needs to work on that to get a good match with our actual mentions from our internal reports.

Check this out - https://support.google.com/webmasters/answer/139394?hl=en Basically, if the same page loads on several URLs, the canonical tag tells search engines which URL is the "real" location of the page.