David Marcus, the longtime Facebook executive who has overseen the company’s embattled cryptocurrency plans, is leaving the company. Marcus plans to leave the company at the end of 2021, he wrote in a Facebook post.The former PayPal executive first joined Facebook in 2014; he ran Messenger for four years before leaving the post to kickstart Facebook’s blockchain division. Since then, he’s overseen Meta’s long-troubled cryptocurrency plans, as well as other payments products like Facebook Pay.“While there’s still so much to do right on the heels of hitting an important milestone with Novi launching — and I remain as passionate as ever about the need for change in our payments and financial systems — my entrepreneurial DNA has been nudging me for too many mornings in a row to continue ignoring it,” Marcus said.Developing