[justrossthings]

>RE: "Facebook/other apps will just store your data after you login anyway, so what's the point?"

Right now, just having user is data is only 'OK'; up-to-date user data is the real goal. People, particularly every marketer's favorite demographic, teenagers, change their tastes and interests drastically and frequently. Just knowing Jenny liked Justin Bieber when she was 12 is almost useless when trying to market to Jenny at age 15.

Into the future 'old' data will further reduce in value as app developers make up-to-date and other hyper-targeted data more available.