Statistical analysis can give you a lot more than just what I like to read. The power of statistics never ceases to amaze:
http://en.wikipedia.org/wiki/German_tank_problem
I'd like to fantasize that there could be a way to use a social network like Facebook with a tool like Ordo -- that is, most the data (photos, in this case) you upload to FB is encrypted, and only people who you've approved can decrypt it. Using steganography this is probably already possible with FB, probably not practical, though.