Chances are that you are getting at least a few emails and IMs with links to YouTube videos every day. While watching these alone can be fun, Synchtube turns this into a far more social experience. Synchtube allows you to share and discuss a video in real time with up to four of your friends. The first person to enter the room controls the playback and also has the ability to change videos.
Features
To get started, just head over to Synchtube.com and copy and paste a link to a YouTube video into the box in the lower right corner. Then send out the link to the room to your friends and start the video once they have arrived.

In our tests, the service worked just as advertised. The chat room itself is basic, but it fulfills its purpose without getting in the way. The video sync sometimes lagged behind a bit by up to 4 seconds. This is definitely within an acceptable range, however.
Just like these commenters on Reddit, we would love to see a few additional features in the app, including the ability to create playlists, search for videos within the app or give control over the room to another user. The developers have promised to continue to work on this app and plan to add more advanced features in the near future.
Verdict
For now, if you are looking for an easy way to watch YouTube videos with your friends without having to install a desktop app like DeskTube, Synchtube is one of the easiest apps to use. The app has some limitations, but for the vast majority of users, the current version should work just fine and most of the current issues will surely be fixed in the near future.