Hah nope it's not. It says smth like "ty for my lover" (like i was the one who introduced him to you and now you are so grateful, in this context).
I guess we don't have this "favourite" and "like" concept as a noun, so we just transcribe these words: "фав" for "fav", for example.
So it would be: Спасибо за фав!
You're welcome!