It's not just someone - it's the BBC.
There are over 800,000 Google results for fileshare. I looked at 30 or so, and didn't find any that use it as a verb, but rather as a proper name or a technical term (often FileShare).
P.S.: The words verbed and fileshare are not recognized by the spellchecker.
P.S. II: The word spellchecker is recognized by Microsoft's spellchecker, but not by Blogger's spell checker.
Oh (edit): Here's a little song i wrote, influenced by these news and The Sex Pistols.
Is this the MPAA,
Or is this the RIAA,
Or is this the DMCA,
I though it was the UK.