A few years after ordinary people discovered the joys of blogging, experienced bloggers branched out into multiple blogs. This led to the rise of niche blogs, blogs devoted to a very narrow subject. The internet audience is so big that even the most obscure topic can gain an audience if it has two things: a good idea and enough material for regular updates. Since readers are often glad to contribute material, sometimes a good idea is enough. Find some really focused niche blogs in this article I wrote for mental_floss.