There is some news coming about mozilla planning to integrate social network into Firefox. If that happens, it would surely give a sharp rise to the popularity of firefox. Youngsters would love it and won't need to log into other services for contacting their friends. That's the primary reason why most people use internet for -- to communicate. It would also give the business model of flock a sharp dent. They have created their own social network on top of browser, but nobody cares anyway. I hope going by the kind of organization mozilla is, they would allow a lot of cross-integration, allowing other players in social networking to use the feature. That would be a step ahead in integration of many profiles created on different web-sites!