App.net: Introducing a free tier Going freemium is a brilliant move. Paying members have long been able to invite people to try the service, but now those invitees can opt for a free plan with a few limitations, such as the number of people you can follow and amount of file storage space. Don't forget: App.net's ambitions go far beyond Twitter.
My friend Isaiah Carew put it quite well:
Right when Twitter is bringing the hammer down on developers, App.net opens their arms wider. It's a good day to be a dev. A very good day.