Can i hold Facebook responsible?

You can consider going after the person that is posting the information. Good luck!

When to form business entity for website that doesn't exist yet?

You should form your business entity before you build a website. There will be agreements that you will sign for the website and you want to make...

How do I sue someone for money over an internet agreement?

I agree with Attorney Nelson. You can sue to recover the money she didn't pay. You should contact an attorney that lives in GA regarding this...

How can I get FB to remove a page that is spreading lies about me

You should read FB's terms of use regarding pages. If you know the owner of the page, contact him/her and inform them of the information posted. ...

Www.ratemyprofessors.com published a page on me that I am a business professor at my college. I am only a student.

Contact RateMyProfessors.com to inform them that your profile should not be there because you are not a professor and speak with your school...

You should speak with your parents regarding this matter.

I'm writing a memoir based off my blog. On my blog I posted pictures of people I dated (with their consent).

If you are going to use their real names you should contact them and get permission to avoid legal liability.

Do i need to hire a lawyer in this case?

You should contact an attorney and also review the terms of use for the website. If there is a special agreement when you purchased you should...

I posted on a former client old Facebook page since I was admin. Before so, I deleted them from the account.

I am unable to answer this because I cannot find your question. Please post your question that you need answered.

An ex of mine is writing twitter post about me in a negative way. This twitter he uses for business, as well, can I sue?

If the information he has posted is False then you may have a cause of action.