Today I went to http://www.freeflour.com/. I have to say I am somewhat skeptical about whether sites like this are really doing anything good or whether they just give the user the illusion of doing something good. However, as long as they are doing something marginally good, I do not see anything too wrong with the idea.
This one is different from the ones I have used in the past - every so many questions one of the questions was essentially an ad. Not too annoying, though, as you just answer it with return to quiz and go on.
2 hours ago