Web 2.0 sites made with drupal

Hello, can anyone point me to web 2.0 sites that have been made with drupal, like clones of myspace and digg? Im considering using drupal for the development of smaller web 2.0 applications but would like to see any examples first. I dont want to use a closed solution because i would liek for the apllication to grow in the long run, an di dont want to have aunique application coded from teh beginning because that can take some time. I would rather use an infractusture like drupal and continue to build from there.
I know that drupal has been used to make digg clones, but somehow misplaced the information. Thanks.