Everything you share on social media is captured, on average, every 30 seconds. If you think you removed it permanently, chances are that it is still out there somewhere. Don't post anything on social media that you wouldn't post on a billboard!
Hackers use the information you post to figure out how to access your account. Using a Multiple Factor Authentication is advisable.
If you receive a message from someone you know and it seems out of character for them, they may have been hacked.