It's not just you, major websites are down, here is a possible reason.

Major websites like #reddit #quora #stackoverflow #Vimeo #twitch #govuk #github are suddenly became unserviceable and went down all at once.
Twitteris also effected but partially, twitter emoji service is not working.
many people on twitter have pointed out a possible reason for this outage can be the scheduled maintaince of Cloudflare CDN.

We will track the outage and update the article with new updates.