Randi Zuckerberg, Facebook's marketing director and big sister, is leaving the company after helping manage its public relations arm since the early years. The elder Zuckerberg plans to start her own company, RtoZ Media, which will help other companies hone their social strategies. It's certainly a lucrative field.

“My goal is to launch my own innovative programming and work with media companies to develop their programming in new, and more social ways,” Zuckerberg said in her resignation letter.

Zuckerberg recently made headlines when she declared that there was no longer room for anonymity online, a view no doubt shared by her little brother.