Roleplay is, literally, such an escape, I love.
As for platforms, I see a lot of people dissing on Tumblr, but thats where I do majority of my rping. I'm in only in one group, and it's definitely not a group for everyone but I've been there for a good while now.
I do roleplay with friends outside of Tumblr if there's a story to my interest.
I recently joined a JCINK rpg, too! Haven't dabbled too much with the group itself, but I'm excited.