Check this link out. Cool because emotions (smile == happy), age, identity and lots more can now all be gathered automatically but its scary because emotions, age, identity and lots more can all be gathered automatically.
Check out the Smart Me Up company web page. It shows a really cool way of presenting all these concepts as well as how far these fields have come.
Joel's Blog 
slick demo ruined by bad choice of music :) who still uses that song anyways?!