There is this (which Google licensed from Yahoo/Overture/Go): https://www.google.com/patents/US6269361 https://www.google.com/patents/US6269361 and then there

There is this (which Google licensed from Yahoo/Overture/Go): https://www.google.com/patents/US6269361 https://www.google.com/patents/US6269361 and then there are the patents filed by Friendster, that Facebook later acquired: https://www.theguardian.com/technology/pda/2010/aug/05/facebook-friendster-patents https://www.theguardian.com/technology/pda/2010/aug/05/faceb...