Tech Crunch:  “Marketers don’t actually want clicks, they want the downstream conversions and the return on investment that follow. So today Facebook begins allowing advertisers using its API to ask it to show their ads to people most likely to take any specific post-click action on the social network, such as sharing a brand’s content to the news feed, buying virtual goods in their apps, or redeeming one of the new Facebook Offers at a local brick-and-mortar store