Same guy claimed to have invented Facebook. (Or some of its features? Wiki's a bit unclear.)

https://www.nytimes.com/2007/09/01/technology/01facebook.htm...

https://web.archive.org/web/20210121084819/https://gawker.co...

There was some kind of settlement eventually:

https://about.fb.com/news/2009/05/facebook-and-think-compute...