Twitter has been on the downslide since forever. Linkedin never really caught on.
I'd be REALLY surprised to see that Google + was on the rise though. Then again, when you're dead last, well, you've got nowhere to go but up.
Tom Whiting, WHMCS Guru
Linux problems? WHMCS Problems? Give me a shout
Check out my WHMCS Addons
+1 - 866-546-8914 / skype - admin_139201 / twitter/facebook - @whmcsguru