Facebook public feed API

i'm working on project which mostly is a data-mining from social networks, so far, i've done twitter and it have really nice API, which allows me to pick an endpoint and recieve alredy filltered twits as streaming data. Now i'm working on a facebook, and there comes the question: with Graph API i would be able to get public feed of some definite page, but what if i would like to recieve posts from as many people as possible? Does Facebook Public Feed API works as Twitter's, and gives me data from as many sources as possible, or i missunderstood something?