The emphasis wasn't specifically on anonymous surveys. At some point I've got a suspicion that people don't use the service as they don't want to expose themsel

The emphasis wasn't specifically on anonymous surveys. At some point I've got a suspicion that people don't use the service as they don't want to expose themselves. As for why you can't do that on facebook/twitter, you can of course. The only thing which is missing is the framework to ask people (put together a nice page with images), collect the results (some server-side thing to record votes), and present them (a results page). Should you decide to make it yourself, I doubt that you'll have it all up and running in less than an hour, which is far more expensive than $2/$10 that I'm asking. Sounds reasonable? One other aspect is that you get opinions of people that are non-geeks and just tell you what they like without thinking about how things are made (colors, composition etc). Fellow professionals or friends / family tend to give their extended opinions which aren't always "welcome". And finally, many will find easy to collect a hundred of votes, but others will not. It just depends on your particular social network. Makes sense? Thanks!