フォローバック

noun, noun or participle which takes 'suru'

follow-back; following back

Internet slang for the act of following someone on social media in return for them following you. Often used in the context of mutual follow requests.

• フォローバックしてもらえると嬉うれしいです。

  I'd be happy if you could follow me back.

• 相そう互ごフォロー希き望ぼうです。フォローバックします！

  Looking for mutual follows. I'll follow back!