Following the MegaUpload shutdown and indictments last week, FileSonic, one of the Internet's most popular file-sharing services, has disabled its sharing functionality.

The service can "only be used to upload and retrieve files you have uploaded personally," according to a note posted on the site's home page. FileSonic also suspended its affiliates rewards program, which paid users when people downloaded their files.

The site offered no official explanation for the abrupt change, but some users blame the MegaUpload action for creating an atmosphere of fear in the file-sharing community.

But Derek Labian, CEO of popular cloud-based file-hosting site MediaFire, told VentureBeat in an interview today that he isn’t too concerned about the government going after his company because, unlike Megaupload, MediaFire doesn’t incentivize piracy.

“We don’t have a business built on copyright infringement.” Labain said. “Like many other cloud-based sharing services like Box.net and Dropbox, we’re a legitimate business targeting professionals.”