Facebook has been busy trying to out smart Snapchat in every way possible since the time Snapchat rejected Facebook's offer of $3 Billion .Snapchat is still a very small company compared to Facebook but it has its own thing going. Snapchat rolled over many new features and even "Spectacles". Snapchat has a constant growth, it's parent company may file for IPO next year.
Here are all the things Facebook copied from snapchat
http://www.businessinsider.in/here-are-all-the-times-facebook-copied-snapchat-in-2016/articleshow/56170772.cms?format=slideshow