Now I have registerd for :
Facebook:
http://www.facebook.com/pengjianqing
Twitter:
Tweets by pengjianqing
Flickr:
http://www.flickr.com/photos/pengjianqing/
http://www.flickr.com/people/pengjianqing/
Friendfeed:
http://friendfeed.com/pjq
And I found friendfeed is so interesting.It supports so many serverces.You can add what you concern to it,then you can get to know all the news.
Registration