Utilize the input text as a context reference, choose the right relationship between Facebook and Mark Zuckerberg from the options. Options: 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