How to say "thank you for following me" in Japanese?

[Jin]

The reason for this is because I want to thank a Japanese user on twitter for following me.

I would really appreciate it if you showed me a formal and informal way. Thank you!

[Dark Tails]

私をフォローしてくれてありがとう
or
Watashi o forō shite kurete arigatō

[顔を持つ少女]

Formal:　私をフォローしてくれてありがとうございます！
Watashi o foro shite kurete arigatou gozaimasu!

Informal: （私を）フォローしてくれてありがとう！
(Watashi o) foro shite kurete arigatou!

NOTE: the "Watashi o" is not really necessary, as it is implied that you are talking about yourself and not someone else (unless otherwise specified). In formal situations you might be more inclined to use it instead of leave it out.