This is pretty cool. As a feature optional language restriction would be nice. My first random tweet was in French, second in Russian, third in Hebrew, fourth in German, fifth was same as second (same person/same tweet), and sixth was in English.
I actually think that result aligns perfectly with the creator's intent: "This is intended as a live demo that most people on twitter are not like you."
I think you're taking only half of a comment and changing the context. "We often think that people use social networks the same way that we use social networks. This is intended as a live demo that most people on twitter are not like you."
I understand that you're using "not like you" in the context of what language they speak, but it seems pretty clear that the author is referring to "the way that we use social networks".