Connections to some websites cannot be established: twitter, github, stripe, battle.net, xfinity.com
https://downdetector.com show how wide spread the problem is.
Edit:
Some reports from xfinity customers in the bay area as well experiencing issues. Connection to AWS for some affected as well
Edit 2:
As of 9:15AM Est, services are back to normal for me. It appears Xfinity is resolving their issues