I don't think I agree with this. A lot of their pictures ARE public domain, and I have to say, the fact that a) they met through youtube and b) managed to create an organic following of nearly a million, not to mention the number of impressions each tweet gets, in a matter of months, is highly impressive. There are plenty of people who use pirated photos through twitter, and true, they are now making a profit from it, but think of the things YOU were doing when you were 17 years old.