Crunchyroll Watch Party is now one of the most popular options. There are over 1,200 series and a variety of simulcast broadcasts available.

Crunchyroll Watch Party

Installing a simple free plugin called BlockSite is the simplest way to block websites on Chrome.

BlockSite

It works like this: you and your buddies each log in to your own Netflix accounts. Choose a movie or show to watch, and Netflix Party will sync your accounts' playback.

Netflix Party