It's pretty well known in the industry, for example they've long ignored requests for basic features (day-parting, A/B testing) that would improve conversion ra

It's pretty well known in the industry, for example they've long ignored requests for basic features (day-parting, A/B testing) that would improve conversion rates for advertisers because they would result in a short-term drop in advertiser spending even though making Facebook an effective advertising platform would be a better long-term solution (revenue wise).