So you see everyone posting these cool videos and you don't know how to share your A Look Back Facebook video...
Most people have a "share" button automatically appear under the video but if you are one of the ones that doesn't have an option to share yours...
Here is the answer...
https://m.facebook.com/lookback/share
It's going to look funny because that m is for mobile... but it does work! Even if you are on your PC.
Have fun sharing your super cool video! And my hats off to Facebook this was a pretty cool thing if I do say so myself!
Happy Birthday Facebook!