I only have an instagram... it's the only one my mom will let me have. Out of the ones I want. Aka Facebook and Instagram. :p I'm not sure if I could do youtube... WAIT!!! I don't need an account for youtube... only to upload things.... so maybe youtube... idk which. :)
#2:Tumblr
#3: Qfeast
I think of YouTube as more of a service than a social network...