Facebook Promotes Social E-Commerce
bits.blogs.nytimes.com/2011/04/06/facebook-touts-social-e-commerce
From the page
Saved with the link. Notes from 2007 to 2016 are mostly the page's own words, so this is probably an excerpt.
Facebook said Wednesday that every time a user posted on their news feed that they bought a ticket from TicketMaster, friends spent an additional $5.30 on TicketMaster (presumably for the same event). At Eventbrite, a social site for selling tickets to lesser known events, every link shared on Facebook generated $2.52 in ticket sales, Facebook said.