Friends are more valuable than family this week, at least as far as net worth goes. Facebook Inc. founder Mark Zuckerberg vaulted past the four members of the Walton family this week to become the 11th richest person on earth. The 31-year old entrepreneur had a $38.6 billion fortune as of the end of trading on Tuesday. That’s just $1.4 billion away from becoming one of the world’s 10 richest people.

Christy Walton, 66, the richest of the four relatives who are the biggest shareholders in Wal-Mart stores, has a $37.1 billion fortune. Zuckerberg has added $4.1 billion to his net worth in 2015, while the Waltons have each lost almost $5 billion, according to the Bloomberg Billionaires Index.

Zuckerberg’s Facebook Inc. passed Wal-Mart Stores Inc. in market cap this week as well, at almost $247 billion. When the social media giant went public in 2012, its market cap was less than half of Wal-Mart’s.

Zuckerberg surpassed L’Oreal matriarch Liliane Bettencourt and Christian Dior’s Bernard Arnault in the Facebook rise on Tuesday. To break into the top 10 he needs to pass Amazon.com Inc.’s Jeff Bezos, who’s added almost $11.4 billion to his net worth in 2015. He’s now worth $40 billion. Bloomberg

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