It's just people flocking to HN for reliable news on the insane outage affecting global Facebook services, and refreshing far more than they usually would. Data point of one
"People look for alternatives and want to know more or discuss what’s going on. When Facebook became unreachable, we started seeing increased DNS queries to Twitter, Signal and other messaging and social media platforms." from Cloudflare via https://news.ycombinator.com/item?id=28752131