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Asking this question to a G+ community might through a bit of bias - but hell, who cares ;) \o/ G+ #FTW  

h/t +Mike Elgan 
Dan Bowsher's profile photoDavid Amerland's profile photoLisa Borel's profile photoLoretta E's profile photo
Still Twitter for me, but I'm using Google+ more now I've switched to Android :)
Facebook of course, isn't it obvious? ;) 
To what end? Day to day, personal edification, G+ of course.
Going back in the time machine to re-locate someone from high school , Facebook.
A catastrophic emergency like a major earthquake or hurricane, or to research for instance what is going on in Mali where a former colleague of mine was briefly Prime Minister in the current junta - Twitter.
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