A big problem for many bloggers is controversial content. For example, about bigfoot, UFO abductions, NAFTA, etc. Most of the fools believe what propaganda they see. It take an intelligent person to digg thru and find golden nuggets of truth.
How to increase page rank for your blog is one major problem. Most blogs are stuck at the bottom with few links and little traffic. Those that contain controversial content are often shut down or hacked.