This is discussion forum that at least nods its head towards science and the scientific method. It is not a blog where you merely share your "likes".
Necessarily, this means that when we're discussing topics that are amenable to evidence-based discussion, that is the kind of discussion that is encouraged.
Moreover, mindless cut-and-paste re-blogging of youtube videos and the like is not conducive to intelligent discussion, especially where that occurs without any thought, commentary, or critical analysis.