At its core, Triberr is a platform to manage groups called Tribes.
A tribe is a group of people, typically bloggers, who write about the same topics. For example, if I like blogger about food, I would look for a tribe that consists of other food bloggers. Once you've identified a tribe to join, you can start by "following" the tribe.
When you "follow" a tribe, you are joining the group as an observer. This means you can see and share blog posts from the group, but they can't see or share your blog posts. This is like an introduction period.
As soon as you follow a tribe, newly published posts from other tribe members will start to show up in your tribal stream (show below):
You'll have the option of approving and sharing those posts.
A word to the wise:
Sharing is not required, although some tribes place a strong emphasis on reciprocity.
After you have interacted with the tribe through sharing, commenting and engaging with members, the Chief may decide to promote you to a full fledged tribe member. As a full member, your posts will appear in the Tribal Stream of other tribe members for them to share, comment and engage with.
You may choose to create and run your own tribe. In which case you will have the ability to invite, promote or remove members and followers at your discretion.