Meet Ken. Ken's a quadriplegic, and has been for about 20 years as a result of a construction accident. Before the accident, he was a casual gamer - but nothing too extensive. Now that he lives a much more confined life, he's looked for things he could still do.
Now, with the help of a device called Joust, he's able to play Diablo, World of Warcraft, and Starcraft - and stream it all through Twitch.tv. He's found a community that's allowed him to gain confidence and have fun, which is pretty fantastic.
Get ready to feel a whole lot of emotions - and remember that every single gamer you play online is a human being, and you could be yelling insults at Ken. Don't be someone who yells at Ken.