Gmail (Google Mail)
Date of use:11/11/11
I have used a Gmail account, and when I have used it on YouTube, I didn't realize that Gmail can do more than just mail. When you have a Gmail account, and when you sign in your Gmail account on YouTube, you can have a history list of recent videos you've recently watched on YouTube, as well as recommendations and suggestions for related videos and subscriptions to YouTube channels. You can even watch age-restricted videos (if you're 18 years or older). Overall, Gmail can do more than just mail — it can do YouTube, too.