Ugh, this is so short-sighted. I get that reading about some of the awful stuff that has happened in past years will make you sad and uncomfortable, but the answer is not to put your head in the sand and ignore them. If you want to feel less depressed, I propose that you stop reading news (and especially commentary) on social media, and instead subscribe to high-quality news outlets such as newspapers. A digital subscription to nytimes is actually pretty cheap.