The SDC change illustrates how DL can use social media to attack program benefits they see as a problem. They've already done this with their award booking system of course. The DL apologists have only themselves to blame for this. Some of them appeared to take pleasure in telling everyone what value there was in SM and how to game the system...in particular, to SDC onto originally more-expensive flight options, perhaps even straight into F on day of departure. Apparently quite a number of DL's Medallions felt this was a significant program perk and used if often. So, DL most certainly does use FT but the communication is by no means two-way. The beady-eyed SM managers in the basement at Virginia Ave watch the threads and develop revenue-containment strategies...before delivering these in their classic drive-by posting the morning of the rescission, if you are lucky. Meantime, want to talk about fake cheese, anyone?