Facebook Co-founder Mark Zuckerberg took to Threads to share an old and a new picture of him and captioned it "how it started vs how it's going" as Facebook turned 20. On February 4, 2004, 19-year-old Zuckerberg with his Harvard University roommates launched the platform under the name "TheFacebook". He's now the world's 4th richest person with $170 billion wealth.