I am shocked by the ignorance here. "Why would Facebook do this? Nobody trusts them, they've run out of ideas, etc." They're the largest social network in the world, and this site is a filter bubble of privacy advocates and relatively anti-social people. Do you truly believe there isn't a market on Facebook for dating? Do you really think Facebook brand is universally tarnished in some way that this isn't a good move…
I can only report on what I see, and my non-tech friends seem even more anti-Facebook than my tech friends. I'm sure there are plenty of users in the world who still love Facebook, but the company has definitely gone past the tipping point of "only techies hate it, and for obscure reasons".