Changes are afoot at Facebook (per iMedia Connection). The once red-hot social network has bid farewell to Owen Van Natta, the CRO who helped the company secure a $240 million investment from Microsoft, and now there are reports that it’s looking for a high-level executive to serve as a kind of second in command to founder Mark Zuckerberg.

According to Kara Swisher at BoomTown, sources close to the company say that Zuckerberg himself has been looking for a well-known technology executive to give him more support.

Such a search couldn’t come at a better time for Facebook, which has been beaten up a bit with reports that its opt-out program was beset by technical glitches. But perhaps more alarming for Facebook are reports that fatigue has begun to set in with users in the U.K. According to a BBC story, the social network saw a 5 percent drop in users from December to January. Facebook now has about 8.5 users in the U.K.