I have had a Twitter account for quite a while but only recently started using it.
Here are a few of the folks I am following on Twitter: Barack Obama, Lance Armstrong, Taylor Phinney, Joe Satriani, John Mayer, Cyclocross Magazine, Spitfire Media...
Wanted to comment on knee problems , but the comments windows does not exist under that topic .
I highly recommend Kneeguru website for all knee related problems:
http://www.kneeguru.co.uk/