Why are all these companies giving data to FB? What are they getting in return? I've looked at this page and they don't mention benefits to businesses at all.
>"see your results in Events Manager and Facebook ads reporting."
businesses want to see if their ads are working. by uploading their visitor records, they can get reports of how many people who saw their ads visited the restaurant.
Better placement in search and greater reach with posts, I'm sure. That's pretty much all FB can use to trade without displaying a currency sign anywhere.