I've noticed that there are a lot of Anime fans out there who use the term Otaku to describe themselves and others who are fans of Anime, Manga, and Cosplay. I've never really understood the term behind it until I looked it up. In Japan, Otaku is generally an insult! It means something along the lines of 'creepy, obsessive loner who rarely leaves the house.' according to Wikipedia. I know, I know, NEVER TRUST WIKI GOSH DESU. /sarcasm. But! There are other sites that have told me the same thing.
In America though, Otaku means.. ah.. well whatever it means over here. I'm not really sure. A fan of Anime and Manga, I guess. :0 I just think it's really interesting how some of us know its true meaning, and how others aren't aware.