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The "invite yourself" address is definitely still working; I tried a test invitation, which worked, and I took a screenshot:
 

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Is google+ still popular? I've heard all about it, but no one I know has signed up to it. Still using Facebook. Personally I see no point in changing at the moment, all my friends use Facebook.
 
Is google+ still popular? I've heard all about it, but no one I know has signed up to it. Still using Facebook. Personally I see no point in changing at the moment, all my friends use Facebook.

Yeah, it seems like a bit of a ghost town if you ask me... A couple of my very-google-loving friends desperately post stuff because they want G+ to take over so badly, but otherwise, I'm still relying mostly on fb.
 
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