Facebook acquired Baltimore-based social networking software firm WhoGlue Inc. early this month for an undisclosed amount, according to a report from the Baltimore Business Journal.

WhoGlue’s founder, Jason Hardebeck, appears happy to be bought by the company that sued him for patent infringement two years ago over “distributed personal relationship information management system and methods.” Hardebeck will maintain his position at the renamed WhoGlue LLC, which will continue to develop private social networks for its clients.

Facebook did not bring over any WhoGlue team members in the acquisition, according to The Baltimore Sun. This is a contrast to its most recent acquisitions, where talent was brought over to Facebook. The social network giant instead will maintain a relationship with Hardeback, should he come up up with any new social networking software that Facebook might like to buy. Given that his last big development was more than 10 years ago and that the team at WhoGlue only had two full time employees at the point of acquisition, this seems like a low-risk arrangement.

There are additional reports that Facebook bought out stakes of several WhoGlue shareholders, including http://bizjournals.com and Seimens AG, but Facebook has only confirmed its technology acquisition and nothing else to TechCrunch.