List of drupal social networks

this is a list of some social networks in Drupal im going to build a social network and thinking of making it in drupal or zend framework. So i have gathered a list in social networks in drupal an this is the list of 20+ links in social networks in drupal, the most have a coupple if 1000 visitors every day so if you are thingking in 1.000.000 users durpal will not fit.

http://drupalsn.com/
http://www.brazencareerist.com/
http://www.fastcompany.com/
http://goingon.com/
http://www.mtv.co.uk/
http://www.symantec.com/connect/
http://www.cnngo.com/
http://aglobalgarden.com/
http://www.thebeehive.org/
http://pugetsoundoff.org/
http://www.amazee.com/
http://www.realtyjoin.com/
http://www.jewcy.com/
http://www.thegardengeek.com/
http://www.sweethype.com/
http://stylelurf.com/
http://www.ecademy.com/
http://www.spreadfirefox.com/
http://life.gaiam.com/
http://www.mylifetime.com/
http://momsteam.com/
http://www.lisa-freundeskreis.de/
http://www.berliner.de/