App.net is a social network that is ad-free and is also a microblogging service. It allows up to 256 characters. The network began as a site where developers could show their applications, but turned into a network similar to Twitter without ads. There is a freemium account and paid account. The paid account user can invite others to try the full version free for a month. The network has around 100, 000 users.
Blue by Marco Amadori, is the first App.net client for the BlackBerry 10. You can post status updates and interact with other App.net users. If you have App.net account and a BlackBerry 10 device, be sure and download Blue free from BlackBerry World.