Pingback trackback is a system used to associate posts on different blogs and, in a greater sense, it allows blogs to "share" readers.
Here's an example of how a pingback linkback works: If you have just posted an article discussing Admiral Byrd's second Antarctic expedition and then happen to run across a similar or related post on another blog, you could use the trackback mechanism to notify the other poster of the existence of your post. When your trackback notification (which is the permalink to your post and, possibly, some basic …

Over the weekend, internet marketing message boards have been buzzing about AWeber Communications… the popular email service provider.
It seems there's a new spam connection between those who subscribe to email marketing offers and AWeber. Those who track this sort of stuff find that they're getting inundated with spam offers — and the common connection is AWeber.
The evidence seems to indicate a very simple explanation… someone accessed AWeber Communications' master database of email address, copied a percentage of these emails, and sent a bunch of pharmaceutical spam.
The spam is not coming …