フォロー

What does フォロー mean in English?

1. follow(n, vs)
2. following (on social media, esp. Twitter)(n, vs)
3. follow-up; following up(n, vs)
4. backing-up; covering for; patching things up; support(n, vs)
5. follow-up shot(n, vs)
6. tailwind; following wind(n)