I am interested in creating and android based app where short posts like twitter can be shared with a group of people who has that app. So for example if 10 people have this app and one of them decided to create a post and share it then all the other 9 people should be able to see it in there feed. I am new to app development and was hoping I can get some kind of guidance from here as to where to start. I am not sure what kind of platform or technology is used in facebook and twitter for this specific purpose but I would like a similar setup. I really appreciate any help or guidance to help me get started and thanks in advance.