Similar to Megaupload, both FileSonic and FileServe allowed users to upload and store files in the cloud and then distribute a link pointing to the file for others to download. This move is undoubtedly in response to the DoJ shuttering Megaupload under accusations of piracy.
FileSonic posted the following message on its site:
"All sharing functionality on FileSonic is now disabled. Our service can only be used to upload and retrieve files that you have uploaded personally."
It's not hard to imagine that almost every file-sharing site is looking at the Megaupload case to dictate how it will operate going into the future. It wouldn't be surprising to see a couple more services amend their rules and terms of service to prevent being shut down.