Twitter, Spotify, Gitub and Paypal are down for me.
The New York Times – nytimes.com – and Reddit are up for me!

 

Some of the affected websites, according to a wordfence.com post.

• Paypal
• Netflix
• Wordcamp (ticket sales were affected)
• Github
• Twitter
• Esty
• Soundcloud
• Spotify
• Amazon
• Heroku
• Shopify
• PagerDuty
• ZenDesk
• Braintree
• Fastly
• Cloudflare