Social channel (s) management

[Bushwhacker]

Can it be considered correct "social channels management"? I have been told a noun working as a genitive before another noun (this latter the subject properly) must go always in singular for it works as an adjective. But occasionally I really have some discomfort.

Other samples: Newsletters creation. Social networks contests.

Thank You

 

[Pangus]

The 's' sounds bad/wrong to me in all cases. I'm pretty sure there are rare exceptions but these examples are not. It's a pretty solid rule.