Getting these players to switch sites--and leave years of stats and league histories behind--will be a high hurdle unless they can bring their data with them.

FORBES: Magazine Article

While deterrent technology is catching up with these networks, violators switch to one-click host sites, like SockShare or PutLocker, which allow users to stream the media directly from the internet.

FORBES: Education Is Best Weapon Against Web Piracy, not SOPA

Now Facebook and Twitter do offer that kind of secure service - but it's not the default option, so users have to switch it on if they want to be sure that their use of those sites is private when they are in a public wi-fi hotspot.

BBC: How safe is life online?

Surface-to-air missile sites and fighter aircraft, for example, reveal their location as soon as they switch on their radar transmitters to look for targets.

ECONOMIST: Remote sensing