They are very interesting but Otaku.HAHAHA.
We can get much information from them. Do you think Otaku means the people who like Animes heavily?? However It is not true. Otaku means maniacs in Japan.They are categorized to many fields. For example,鉄道おたく、 アニメオタク、戦国オタク and many.
They have much information about their commitment. And they write what the others don't know.
It's very useful when I want to get tips.