There's no spike in request rate (activity) on June 8th. There are spikes in vote and comment processing backlogs, related to a Fastly outage that effected Reddit on that date.
Fortunately social media sites are not very critical services.
You could have reddit, twitter, fb, ig, hn, down hours per day and nothing bad would happen. Maybe even something positive. It's only problem for those companies because they lose some ad revenue.