It also measures my sleep (based on movement, not brain activity) and has a Web interface and smartphone app for logging what I eat and checking calories burned.
They come from numerous sources: from players logging in through their console (Xbox, Wii, etc) to play the game, using apps on their phone to look at their teams and make trades, and logging in through the Web to check out the options market.
Web sites are layering on more security to fight the common Web scam known as phishing, in which spammers lure people into logging on to a bogus site and steal their user names and passwords.