Twitter continued to hemorrhage top executives, with Tuesday bringing the departures of chief technology officer Adam Messinger and vice president of product Josh McFarland.
Messinger did not reveal his future plans, saying in a tweet that he will ?take some time off.? He had been with Twitter since 2011.
After 5 years I?ve decided to leave Twitter and take some time off. Grateful to @jack for the opportunity and to my team for shipping.
— Adam Messinger (@adam_messinger) December 20, 2016

McFarland joined Twitter when it acquired his ad technology startup, TellApart, in April 2015.
He is heading to Greylock Partners, where he will be an investment partner. McFarland also announced his departure in a tweet.
1/ Some personal news: I am excited to announce I will join @greylockvc as a general partner next year https://t.co/8YwCQZQIwp — Josh McFarland (@crazyfoo) December 20, 2016

Greylock added in an announcement that McFarland will join the firm in the first quarter of 2017, saying of his appointment:
From his work at TellApart, Twitter and Google, he has personally experienced the stages of building an enduring business–?from pre-product market fit, through early scaling, through growth stage, through operating inside of a mature, public company. He has grown from a product manager who oversaw teams of four or five people early in his career at Google to a founder and CEO and operating executive leading teams of 400 to 500 people. He?s a product perso...