That kind of makes sense given you have to sign in via Facebook (which is why I intially didn't try tt.fm).

My senses point to it. From my perspective it makes sense because you can't really point to it being a "serious" app that [serious] matured users would point to as a sense of belonging and we all know that Facebook users have no embarrassment at all when it comes to publicizing anything and everything they deem worthy in an effort to appear cool and belonging.