3 simple steps
Aim
Carefully consider what you are reacting to. Perhaps reacting to that 4chan thread isn't the best choice. Your face breakingly wide smile at watching a midget run over by a truck may hurt future employment chances.
ScreenFlash™
Your screen turns white while your reaction is being captured. A feature? Or am I just too lazy to add another UIView to the app. You decide.
Share
As previously mentioned, we love sharing. Originally we had 1-Click Sharing, but after consulting with our attorneys, they suggested it might infringe on Amazon's 1-Click patent. So we changed it to Minus 1-Click Sharing. Meaning it takes a click to not share. Groovy.