This document summarizes Twitch and Discord, two popular platforms for live streaming and communication among gamers. It discusses their origins in the rise of esports and gaming culture. Twitch started in 2011 and was later acquired by Amazon, becoming the dominant social live streaming platform focused mainly on game streams. Discord launched in 2015 and is popularized as "Slack for gamers" that is integrated with Twitch and Steam. The document provides some statistics on Twitch's daily active users and peak traffic times, and gives examples of how libraries are using or could use Twitch and Discord to support gaming and adult programming.