There are rumors that Geoffrey Arone, the co-founder and Chief Strategy Officer of silicon valley based Flock, is leaving the company to become an Entrepreneur in Residence at Bessemer Venture Partners (one of the original Flock investors). The other co-founder, former CEO Bart Decrem, left Flock late last year.

Flock recently replaced Decrem with a Yahoo veteran, Shawn Hardin. No word on who, if anyone, will replace Arone. Also no word on what new startup Arone will be working on at Bessemer.

Look for a blog post on the official Flock blog soon. Our previous coverage of Flock is here.

Update: This is now confirmed. Arone commented below, saying “I will be working closely with Flock, which is a Bessemer company. I have enjoyed working with Bessemer throughout and this opportunity presented itself. Flock is well-aligned with partners and is burning the midnight oil to get the 1.0 out. My Flock e-mail will still be in tact and if you know any good BD/Strategy folks, send them my way. Cheers, Geoffrey”