http://www.rembrandtip.com/pdf/2013-02-04RembrandtSocialComp... (With Facebook and AddThis as defendants)
Here are the two patents in question
http://www.google.com/patents/US6415316 (1998, Method and apparatus for implementing a web page diary)
http://www.google.com/patents/US6289362 (2001, System and method for generating, transferring and using an annotated universal address)
And here is a patent supposedly in the hands of Facebook right now, that references one of the above patents. This is now used to claim that Facebook knew of the patents, and willfully infringed them.
http://www.google.com/patents/US7907966 (2011, System and method for cross-platform applications on a wireless phone).