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 all started when Facebook chief executive Mark Zuckerberg changed his profile picture with a tint of green, saffron and white for the Tricolour in a symbolic gesture to suggest he supports Prime Minister Narendra Modi's "Digital India" campaign.

Answer: founded_by