Big social networks put plenty of Drupal websites out of business: anyone can create a group, say, on Facebook, and it’s much easier than to build and support whole Drupal website.
Now we want to get Drupal web-masters back into the game, arming them with the same functionality major social networks have.
The GRA4 Social Network for Drupal empowers your website with Social Networking features.
Drupal Social Network Demo: http://drupal.ucq.me/gra4/activity
Free hosting with auto-installer (Drupal supported): http://ucq.me
After single 3-minute-long installation your Drupal website will have social features likes, friends, groups, blogs, messaging, activity stream, market, events and much more. Wiki: http://en.wiki.gra4.com/Category:Webmaster_guide
Before you install this Drupal mod, please make sure you are installing the newest version: http://gra4.com/file/group/99/all

GRA4 Social Network for Drupal Web Site