For some reason, spammers think that blogs are great targets. However, any up-to-date blogs really aren’t.
The whole idea is to target dead blogs or old blog posts Then they automatically put in a link in the comments area and move on. Sometimes hitting hundreds of posts at a time. This use to be a good link building tactic, however there is now the nofollow tag.
The nofollow tag gets embedded into a link and it tells search engines not to follow it, thus not passing any link popularity. WordPress is one that automatically puts nofollow in all comments posted. Thus, any spammer is just waisting their time.
To stop spammers in Wordpress, get a plugin like Spam Karma that works great! It blocks so much spam automatically. There are also preferences in the admin area of Wordpress to turn on keyword filters and moderation features so that you control what actually gets posted.
Blogger and Typepad also have a good system for blocking spam. Since they are all run though a much larger system, everyone benefits from the admin implementing anti-spam features.
Bottom line is that your blog will probably get spammed. But there are many resources out there to help and get the spam problem under control.
