Conduct a search for literally any letter in the alphabet. Try a search for [s] in Google and the number two result, at least for me, is a Twitter username/profile.
Most single letters come up on the first page. Try [a], [b] or c], all on the first page. Not every letter is on page one of Google, but many.
This was pointed out in a WebmasterWorldthread. Tedster, the administrator of WebmasterWorld said:
Funny you should mention it - yes, Twitter profile names do seem to be ranking better.
Twitter, the next Wikipedia?
Forum discussion at WebmasterWorld.


Comments:
Richard Boyd
07/23/2010 06:32 am
Personalised results perhaps? Not seeing it here (UK) BTW we don't use Twitter...HTH. Rich
niks
07/23/2010 09:20 am
I too found quite a few twitter users in top google search results. I guess your twitter account can be huge source of traffic for your site
No Name
07/26/2010 09:06 am
I can not see it too, I second on this, seems to be personlized result
No Name
07/26/2010 09:08 am
I agree its a personilzed result as its not showing here
Alex
07/26/2010 09:27 am
Really , twitter is the best source of getting traffic and according to my experience some twitter users is also getting ranking in google.