I read somewhere (in passing, since I don't generally watch the CW) that several of the producers/show-runners for CW shows were asked to limit their spoilers. At the time I assumed they only meant the superhero shows (Arrow, The Flash, etc.) but perhaps it was a network-wide request. I can understand why they might do this, because when shows "over-spoil" (share too much) they might give enough away to allow some viewers to keep up without watching. Daytime soaps go through phases where they over-spoil, then pull back on info, then panic and start over-spoiling again, worried that the lack of "buzz" means people are losing interest.