What were the technical limits that Twitter reached with Ruby on Rails?

What were the technical limits that Twitter reached with Ruby on Rails?

Quora question that has some well researched answers.  This is quite handy for any system architect or web developer.

Launching in 2015: Let’s Encrypt CA

Electronic Frontier Foundation reports some excellent news:

encrypt-2

Today EFF is pleased to announce Let’s Encrypt, a new certificate authority (CA) initiative that we have put together with Mozilla, Cisco, Akamai, IdenTrust, and researchers at the University of Michigan that aims to clear the remaining roadblocks to transition the Web from HTTP to HTTPS.

More specifically:

With a launch scheduled for summer 2015, the Let’s Encrypt CA will automatically issue and manage free certificates for any website that needs them. Switching a webserver from HTTP to HTTPS with this CA will be as easy as issuing one command, or clicking one button.