Its appears that sometimes a post gets infected by the spam-bots and finds itself attacked by links to all kinds of pornography, antibiotics, drugs for erectile dysfunction, SEO optimization, payday loans … you get the idea. I had to delete my “about us” post because I was deleting hundreds of these disgusting spam posts every day. I suppose I could pay for the spam blocker plugin, but I should not have to. WordPress should fix this issue. It will be interesting to see if the bots try to attach spam to a post cursing them.