Gab is a social media site that has been criticized for providing a platform for white nationalism and anti-Semitism. The suspect in the Pittsburgh synagogue shootings last month was a Gab user.
In the days after the shooting, several companies, including cloud host Joyent, domain registrar GoDaddy, and digital payment companies Stripe and Paypal, cut ties and suspended Gab's accounts. This forced the site to shut down for more than a week.
The company that got Gab got back online is called Epik, which is the Internet server that is now hosting Gab. Epik's move triggered the investigation by the Pennsylvania attorney general.