Wall Street Journal: Consumers flocked to social media services over the past decade and marketers followed. But according to Forrester Research, ads perform better on some social networks than on others. Facebook is leading the pack when it comes to ad efficacy, analysts Nate Elliott and Richard Joyce wrote, in a new report titled “It’s Time To Separate Social From Media.” The social media giant’s ad products deliver better results than those of its competitors, the report said.