to be honest facebook still accept crypto related content but only the classified ICO, and etc  except those sites known as ponzi schemes that can destroy the reputation of facebook..But anyways about that article i think its good idea if facebook create their own crypto currency 'cause it's a big help also to promote other crypto currencies in the market especially bitcoin.. And perhaps there's a chance facebook to replace bitcoin because of being popular which cause to create a masive demand in the market and over take bitcoin.