Identifying real people is a core concept at Facebook. and something they have got right (identity) and google will find difficult to replicate.
 I wouldn't have realised this point as quickly had I not read "The Facebook Effect" ~ http://www.amazon.com/Facebook-Effect-Inside-Company-Connect... which despite its flaws gives some useful insights. Excerpt: http://techcrunch.com/2010/05/06/facebook-david-kirkpatrick/
If I'm searching for a good online backup service I care more about the opinions of people I follow on twitter than those of my non-technical friends and family, etc.
It knows my Twitter network, of course, and that's helpful for search results (someone I follow on Twitter blogging about some arcane JRuby tidbit I'm searching for is great).
If this is what Google's leaning on for their new social graph stuff, though, they're in trouble: it knew very little about my real-life friends. In other words, the friends that Facebook knows about. You can't glean that from Gmail contacts necessarily, since I don't really use email for that type of correspondence. If they really do want to flesh out a social graph of their own to combat Facebook, they have to roll their own social network. Maybe it's coming, maybe it's not; I just think they're only getting part of the picture right now.
121 Direct connections from links... which duplicate some of my close friends and then contain a load of bogus entries I don't recognise. These are all based on Flickr apparently.
3905 Secondary connections that do contain acquaintances, some good friends and lots of people I don't recognise.
It didn't do a bad job, but given that I use Google Chat and Calendar to organise stuff, that I use Google Contacts because of Android and that I have a lot of history in Google (email loaded from 1996) I'm not surprised that they have such a complete picture.
Edit: Just read up on it... it's figured out so much as I'd added sites to my Google Profile and it's followed those to determine the rest.
But, interestingly, I got a 404 when I logged out.
Edit: actually, I can't log out. Fascinating, I know.
Just go to some other Google site (docs, gmail, maps) and logout from there.
People I haven’t followed on Twitter or Flickr in a year still show up in the ‘Direct connections from links that appear on your Google profile’ section.
Also are they using meta data like XFN and microformats to garner some of the data or is it just internal Google social links?
You can always just edit your contacts on the original sites where the information came from and either wait for a recrawl or force a recrawl using: https://sgapi-recrawl.appspot.com/
Considering that I am the ONLY person on Facebook with my firstname/lastname, and that my 522 Facebook friends are publicly accessible, how and why is Google not indexing Facebook? Is it just a matter of pride?
Guess my friends are tight-lipped with Google.