My choice will be definitely facebook, and here is why...
Unlike the other social medias, at facebook you have the free will to choose what ever you like to do. You can like, comment, posting everything (status, pictures, links etc.) and most of all, you can like pages or follow then and read the news.
Basically, facebook gives you everything and you can choose what you will do. Here, I will tell how I use my facebook daily...
I like pages who shares articles that I want to read. Every day I spent around 2-3h on reading. After I learn how to use facebook, I find my job, change my hobbies and sports activities and most of all, I finally have friends that I know them!
![Wink](https://bitcointalk.org/Smileys/default/wink.gif)