Yeah! On Youtube you subscribe someone. On Deviantart you "watch" someone. On the top right of the page there's three buttons.
+ Watch,
Send a note, and
Give.
+ Watch means you when ever they post something you get notified and you can choose some people you want to be friends. When you
send a note it means like sending a private message. And a
Gift can mean you can give someone points, a paid membership, a cake, (or a more popular one because it's free and cute) a llama! Like I just gave you a llama!
And when you click on
+ Add Media that means you can add emojiis or any kind of little GIF to fit your message. Like this!