Google +
Well, I joined Google+ while in France. Which has resulted in a strange blend of English and French in by Google+ page (Franglais?). Anyway, until I build up enough contacts in my circles, I see tumbleweed blowing. The interface is clean and easy to use, far less cluttered than Facebook. I picked up a link to this xkcd cartoon (amusingly, via Google+).
[caption id="" align="alignnone" width="428" caption="Google+"][/caption]