Some time ago I was thinking about stopping using Google services, so they won't have information about me through my content anymore. And then it struck me: If most of my friends and colleagues have their content in and through Google, then Google must have all my content anyway.
If I write emails to @gmail-addresses, if I chat with through jabber with friends who have GTalk-accounts etc. - my content is at Google.
And so it is not surprising to see these social connections, that Google aggregates about us.
(cc-by-sa) since 2005 by Konstantin Weiss.