Facebook's Josh Williams and Instagram's Tim Van Damme are leaving their respective social networks this week.

Facebook today confirmed the departure of Josh Williams (pictured), co-founder of Gowalla, the location-based check-in startup, which the social network picked clean for its talent in late 2011.

"Joshua has been a valuable member of Facebook," a spokeswoman said in a statement emailed to PCMag. "We wish him the best of luck with his future endeavors."

Williams's next move hasn't been announced, but sources familiar with the situation told All Things D that he plans to stay in San Francisco to work on starting a new company.

Since joining Facebook in 2012, Williams has worked as a product manager for Facebook Pages, Locations and Events. Most recently, he helped revamp the mobile Pages product, which streamlined on-the-go actions, according to ATD.

Williams's last day will be on Friday.

Meanwhile, Tim Van Damme - former Gowalla designer who made the jump to Instagram - revealed this week that he too will be leaving the photo-sharing service, which he joined before it was acquired by Facebook.

"The past 18 months were some of the best of my life, both personally and professionally," he wrote in a blog post. "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."

Citing the need to move on, to "solve a different set of problems," Van Damme revealed that he will join Dropbox in early August, after spending some time with his family.

In his year and a half with Facebook, the 28-year-old Belgian native played a large part in building the aesthetics of Instagram across the iOS and Android platforms.

Van Damme joins a lineup of former Facebook-based designers who landed at Dropbox in the past year. Designer Soleio Cuervo started the trend in late 2012, followed by Rasmus Andersson, who joined the cloud storage company in March.

A Dropbox spokeswoman declined to comment on Van Damme's joining the company; she instead pointed to his personal blog post, and said they will share more details "once he's on board and gets settled."

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