Traffic to your blog can come from a variety of sources. You’ve got people searching for things on Google, people reading interesting stories on Digg, and people sharing their thoughts on Twitter. Depending on the path that people take to get to your blog, you may feel inclined to treat them a certain way. This is about targeting and reader retention.

A great WordPress plug-in that addresses this very concern is Referrer Detector. As its name implies, the plug-in is able to detect the source of the current visitor. So, what advantage does this have over other web analytics data? Well, Referrer Detector is actually able to use this data to provide a custom greeting.

For example, if a visitor comes from Digg.com, the greeting at the top of the post could be to remind them to Digg the post. If a visitor is referred by Twitter, the greeting can ask them to retweet the link to the post. It’s totally up to you how you want to use this and the custom greeting, which you can compose yourself, can be placed either at the top or the bottom of a post. The custom greeting can contain WordPress attributes too, like the particular URL or post title.

For more information and to download Referrer Detector, check out the official page at WeblogToolsCollection.com.