Google's growing G+ surveillance is a worry. This is why after watching the 29C3 keynote (http://www.youtube.com/watch?v=QNsePZj_Yks) and whistleblower panel (http://www.youtube.com/watch?v=XDM3MqHln8U) a couple of days ago I blocked all the main google domains (mail, maps, G+, accounts, picasa, etc.) via /etc/hosts and committed to only accessing Gmail via Tor (https://www.torproject.org/). Facebook I already deleted and block via AdBlockPlus (though I now recommend http://trueblockplus.org/), but G+ is harder and more insidious to stay free of. After a few days of use, I am quite happy with my new strategy: keep email (or anything personally identifying, like banking) in a different and anonymized browser. Keep everything else in a general browser that never sees you identified.

Edit: add URLs, TrueBlockPlus reference.