Mixi (the most popular social networking site in Japan) has had this feature since the beginning and it certainly changes how people use the site. Actually a

Mixi (the most popular social networking site in Japan) has had this feature since the beginning and it certainly changes how people use the site. Actually a year or two ago they finally added the ability to delete your tracks after viewing someone else's profile. I think you can only delete 5 per day though, so you still can't stalk on Mixi all day without any trace.