I want to know if facebook has any liability over their failed "block" setting.

This is general commentary and not legal advice. In general, such liability turns on whether Facebook's functionality was misrepresented to you...

How can I find a honest attorney

I agree with Ms. Goldstein that most attorneys are honest and hard working. It sounds like you may have had a bad experience or know others who...

There certainly are practical reasons to want to have such a camera for protection. Different states have different laws about "recording" others....