After reading the article, I looked into similar services available online. While I couldn't find any blogging sites, both WriteAPrisoner[1] and PrisonPenPals[2], while dated, offer to connect visitors with incarcerated pen pals.

Even more interesting, however, is that the State of Arizona banned these types of interactions in 2000[3], only to have to the law struck down as unconstitutional four years later. Specifically, the law banned any "attempts to correspond with a communication service provider or remote computing service" such as the sites listed above.

[1]: http://www.writeaprisoner.com [2]: http://www.prisonpenpals.com [3]: http://www.ojr.org/ojr/law/1082592378.php