copycat sites

facebook
http://jeremy.zawodny.com/i/facebook-profile.jpg
xiaonei
http://soft.yesky.com/imagelist/2008/016/8t1dt736bw55.jpg
twitter
http://www.techxav.com/wp-content/uploads/external/farm4.static.flickr.com/3443/3391630305_6b5ae3f10f.jpg
fanfou
http://www.distilled.co.uk/blog/wp-content/uploads/2009/07/fanfou.jpg
digg
http://www.brentcsutoras.com/wp-content/uploads/2010/03/digg2-0.gif
chouti
http://img.cnbeta.com/newsimg/090116/09441831265372565.jpg

And some subtler ones:
(Read the article)