I'm not sure "cherry-picking while removing context has been crowd-sourced" is a great argument for the victory of truth (of the idea of media bias, presumably)

I'm not sure "cherry-picking while removing context has been crowd-sourced" is a great argument for the victory of truth (of the idea of media bias, presumably) over propaganda, but I take your point that the initial drive over a few relatively-centralized media to promote and categorize a "left-wing media" is no longer the main source from which people are receiving that message. (FWIW, I actually agree with you that many outlets have a consistently left-wing slant, for certain values of "left-wing", on a variety of issues, and I think most of what passes for news media generally is absolute garbage—but I also think that perceptions of that, on the right, tend to be only loosely related to reality, and that media coverage of media bias, to include social media, is itself ground zero for bias)