There are still file-sharing companies that are available, but it must be said that illegal files are not allowed to share via the options you have in mind. I would advise you to stay away, anyway. I recommend, however, a transition from filehosts to torrents.

There are countless number of threads here on KWWHunction regarding the closure of all the major file-sharing companies. What scared away most were the MegaUpload case where the FBI decided to play God.