What is the relationship between Facebook and Mark Zuckerberg in the context of the input sentence. Choose an answer from: product/material produced; manufacturer; distributed by; industry; position held; original broadcaster; owned by; founded by; distribution format; headquarters location; stock exchange; currency; parent organization; chief executive officer; director/manager; owner of; operator; member of; employer; chairperson; platform; subsidiary; legal form; publisher; developer; brand; business division; location of formation; creator.

It seems like this has been a long time coming, but CEO Mark Zuckerberg has now confirmed that Facebook ( NASDAQ:FB ) is working on a counterpart to its hugely popular "Like" button.

Answer: founded_by