Do you have any evidence of this or is it just your supposition? People used to think the same thing about posting on Ask MetaFilter, and when people actually

Do you have any evidence of this or is it just your supposition? People used to think the same thing about posting on Ask MetaFilter, and when people actually looked at real data, they determined that the number of people interacting with a post was roughly the same no matter when it was posted, because of the phenomenon I mentioned—in a community where everyone can post, times where the audience is bigger also mean bigger competition for attention.