Why Some Social Sites May Survive Adsense Panda
A lot of the reason social sites are still thriving is the advertising. Most of them do get Adsense for there ads. But social networks are more on comments and communication. The way it seems to be going is quick and simple posts that don't stay on a website very long. Those who have blogging on their sites have less chance of webpage views being abused.
People make there post and it is read for a few days and then gone from the site. Kind of why Bubblews removes some of your posts all the time from your profile. Even though your older posts are still seen on the Internet if you have the old url to look them up. But they are not on the site for everyone to see.
The less time a post is kept for viewing means less chance someone can pay for views. That way advertisers don't have to monitor the sites as much for view abuse. It is a simple way to stop all the abuse that sites constantly deal with.
It makes sense from an advertisers point of view as well. If your ad is constantly being seen from the same place you don't get new traffic. But new and constant posts will generate new traffic all the time.