Tapping a yellow Watch button on that page launches the app in question — YouTube for a Saturday Night Live highlight, for example. (tomsguide.com)
Users with access will see a TV - shaped Watch button in the bottom navigation bar of Facebook's main app that opens the new video hub. (beta.techcrunch.com)
Internet access Power button on the side Social media integration — you can share to your Facebook or Twitter account from the watch (techpp.com)