In the next several years, it might be weird to _still_ have a Facebook account. Just like an AOL email, myspace account...
I left FB in 2009 and haven't looked back.
Other commenters have already addressed the notion of whether a file can be legal or illegal in and of itself.
However, it seems that the article in question, and the ensuing discussion here, is confusing illegal files with illegal file transfer.
For example, while a copyright-protected music file is illegal to download in the U.S., it is perfectly legal to download in Canada.
Thus, the discussion becomes unclear as to whether we are discussing illegal files or illegal file transfers.
"Take that, you hostile sons-of-bitches!" -- James Coburn, in the finale of _The_President's_Analyst_