Best technique in an offline and online newsfeed app like facebook

I am currently developing an android app that has newsfeed and relies the data from the backend. I just want to know what's the best technique to load it offline like facebook app. Do i have to create my local db?

And I want also to know how to load it faster when fetching data online. Because when I fetch data online it needs more seconds or minutes inorder to load my data from the backend. I am using libraries, retrofit and universal image loader.