Yes, but much of it isn't design as good, or maybe is, but regardless, email is still better for many things, enve if you do have other stuff too. I don't use Facebook, Twitter, GNU social, or Diaspora; none of them are so useful to me. I do use IRC (although I wrote my own client since I don't like the other ones I found), and would use NNTP if they made that available.

Also, as mentioned, you may want to keep some things private. I do too, but may want to write things to public too, although the stuff mentioned above I do not find useful, and neither does Stallman, presumably.