No they are not going to start charging. It's a social networking empire and I'm sure they want to keep it that way, if they start charging more then half of the people will start to look for another social network to use. Which of course is bad for business
No it's a hoax that has been going around for a long time, and every so often resurfaces. Facebook is not going to charge, especially now that they have to compete with Google+, it would be the quickest way for them to go out of business.