The vast majority of cool, hip startups nowadays have absolutely no interest in profit or even simply revenue. Just gotta stack those users up.
Avatars are just one of the many ways we're helping serve media for developers, brands and publishers. Fortunately, many of these same folks are also now using our API and other services, which we do in fact charge for.
Foursquare (though it appears they've seen the light a few weeks back finally)
Color
AirTime
Path
There's five. I can continue.