Found this in a news article:

Several cyber attacks disrupted Web traffic on the East Coast Friday, shutting down access to some of the Web’s most popular sites and frustrating their users.

A slew of major sites including Twitter, Netflix, and Spotify were affected by what was described as a DDoS, or a distributed denial of service attack, on the Internet services company Dyn.

Sites taken down by the DDoS attack today:

• Twitter
• SoundCloud
• Spotify
• Netflix
• Reddit
• Disqus
• PayPal
• Shopify + more