Dive summary: 

• Tom Arrix announced he will be leaving his post as VP of sales at Facebook, where he oversaw media strategy and managed ad inventory and operations for the East Coast sales team.
• During his seven-year tenure, Arrix said in a note on Facebook, the user base for the social network grew from 8 million to 1.2 billion. 
• Arrix's departure closely follows former director of ad products Gokul Rajaram leaving earlier this month to join Square as a product-engineering lead. 

From the article: 

"Facebook's VP-global marketing solutions Carolyn Everson will fill Mr. Arrix's role until a replacement is hired, according to a spokesperson."