We were just talking about this at lunch. Sooner or later, someone has to start turning a profit with all these social media applications or they won’t be around – at least in their current (free) form. I find it hard to believe ordinary users would pay a fee to remain on Twitter, but you never know. I know at this point I wouldn’t pay as an individual.
http://mashable.com/2009/03/28/monetize-social-media/