Posterous has announced an update to its mobile apps for iPhone and Android. The updated versions lets friends, family members and colleagues now create and participate in a Posterous Group from their phone, the Web or via email without limitations.
Posterous Groups, which is an email list-like service that can be used either as a traditional email list, or as a group sharing service. Up until now, you could only set up a new group via email. And, each Posterous Group gets its own beautiful private web site.
Once a group is created its members can share text, images, videos, music, and other file types -- either by emailing that group's unique address, or, from now on, by using either of the Posterous mobile apps.
Besides creating and viewing groups, the apps allow you to add group members from your mobile contacts and quickly interact with posts from other members of a group.