App.net has released a free tired version of the relatively new service. The freemium tier of the network does however include certain restrictions compared to paid members including;
To get a freemium account you must be invited by a current paid user of the service.
Users in return have been given an incentive to invite users to the service, with each referral earning you and the user signing up an extra 100mb of storage providing that the following goals are achieved.
You can read the official announcement regarding the app.net freemium version on the networks blog.
Finally if you’d like an invite to the app.net please leave a comment below and don’t forget to follow us at alpha.app.net/3manfactory.