Interpublic's five year-backing of the social network nets a large return on a reported original investment of less than $5m.
Advertising company Interpublic Group has sold about half its stake in Facebook for $133m after having backed the company in 2006. The buyer was undisclosed.
The stake sale valued Facebook at $66bn, according to news provider Financial Times, which said Interpublic had a 0.4% stake before the sale.
Michael Roth, Interpublic’s executive chairman, said: "Interpublic formed a strategic relationship with Facebook in 2006 that allowed us to fast-track the growth of our social media offerings on behalf of clients.…
