Some time ago, I talked about how all social channels seem to to generate overtime as the core enthusiasts who gave them their and national life lose their energy and move on to other projects, and the channel is taken over by the great unwashed masses. More and more people move into the channel who don't have the expertise nor the commitment to the ideals to maintain the quality of the channel; nor frankly the intelligence in a lot of cases to be able to contribute constructively.
Somebody - and I hasten to add not me - coined the term England's Law for this principle: "all social channels degenerate". So I want to slightly elaborate that initial statement into are more specific England's Law v2: the discourse in all social media communities degenerates into spam and derp.