How do you know if you've been hacked?

Related questions

1. Can I get my facebook account back?
2. How do I sign up for Facebook?
3. What to do if Facebook is not working?
4. Is there a way to get free data?
5. Do you want to log in to or join Facebook?
6. How do you recover a Facebook account?
7. Does Smart have free data?
8. Can you find out who hacked your Facebook?
9. Has Facebook been hacked today?
10. Can I reactivate my Facebook account after 2 years?

Tags

1. #settings
2. #passwords
3. #signs
4. #common
5. #additionally
6. #which
7. #occurrences
8. #computer
9. #activity
10. #changed
11. #longer
12. #frequent
13. #unusual
14. #toolbars
15. #browser
16. #hacked