What social media site do you use the most?

It's a simple question I have for you today.

Out of all the options out there (and they are legion) which social media site do you like/use the most?

Facebook?
Twitter?
Tumblr?
Pinterest?
LinkedIn?
Goodreads?
YouTube?
Google+?
Reddit?

Some sites are more niche or obscure, while others are more general use, but I think people still have loyalties and preferences. Even if they use multiple sites, they enjoy one over the rest.

So which is it for you all? Which site do you spend most of your social media time on? And a follow up question. What do you do mostly do on that site? I'm talking specifics. I'm curious. If it's Facebook, do you look through pictures? If it's Twitter, do you browse celebrity feeds? If it's Pinterest, do you mainly browse for recipes?

Yes, this is basically a poll post, but I'd still love all y'all to answer :)

Sarah