"Technically, if I republish your email to me, you can sue me." There are also long established exceptions to this. Many writers have got around this by publis

"Technically, if I republish your email to me, you can sue me." There are also long established exceptions to this. Many writers have got around this by publishing users emails in book simply by putting a clause stating something like 'by sending me an email you are agreeing that I have all legal rights to the work'. As long as you make it explicit then you can own someones email, however there's no explicit notices anywhere on FB that they have a right to any information you give.