Facebook Inc (NASDAQ:FB) lost yet another executive after Tim Van Damme, lead mobile designer at Instagram, decided to leave the company to assume a new role at Dropbox.

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Van Damme’s Blog Post

In a blog post, Van Damme said it is time for him to move on, and to solve a different set of problems after 18 months working with some of the brightest minds in the industry. According to him, he will take some time off with his family, and he will join the Dropbox team early in August.

Van Damme wrote, “The past 18 months were some of the best of my life, both personally and professionally. I’ve had the opportunity to work with some of the brightest minds in this business, on an app that transformed the way people interact with each other every single day, and also made a lot of new friends.”

He added, “Dropbox is a fascinating company. It provides value to a wide range of people, not just those who build things. I can’t wait to learn from all the talented people I will soon call colleagues.”

Since January 2012, Van Damme served as the lead mobile designer at Instagram. Prior to his role at Instagram, he was a designer at Gowalla, the company acquired by Facebook Inc (NASDAQ:FB).

More Resignations for Facebook

Yesterday, AllThingsD reported that Josh Williams, product manager of location and events at Facebook Inc (NASDAQ:FB) is leaving the social network giant after one and a half years. Williams was the co-founder of Gowalla.

A spokesperson for Facebook Inc (NASDAQ:FB) said, “Joshua has been a valuable member of Facebook. We wish him the best of luck with his future endeavors.” According to sources, Williams is planning to start a new company in San Francisco.

In June, Gokul Rajaram, the former product director of the social network giant, resigned to serve as product engineering lead at Square, a mobile payment company offering free credit card readers for the iPhone, iPad, and Android devices. Earlier this year, Facebook Product Director Blake Ross left the company to explore new things. He also stated his concern over the long-term viability of Facebook Inc (NASDAQ:FB).

Last year, Bret Taylor, the former chief technology officer of Facebook Inc (NASDAQ:FB) unexpectedly stepped down from his position to establish his own start-up company.