The short answer is that will be up to a judge to decide.

The 22 year old is a predator IMO. No way in heck they should date a 16 year old, especially if one of the parents says no.

"Creepy" is not a legal term but, yeah, it's creepy..

That's really weird. Talk to your parents.

IMO you are the owner. The only way they can get it back is to sue and prove that the money was a loan, not a gift.

Google Underage girl scam. Block all communication with "her" and don't send any money.

I had the exact same thing happen to me. My insurance company listed it as a "phantom driver" and I was not held liable.

The only advice any of us can give you is to retain a local attorney.

You will never prevail in a lawsuit against twitter, but you may be able to sue the person who posted it.

I assume that is solely up to your potential employer.