What Facebook is really copying from Snapchat

It certainly seems that Facebook has been taking some 'inspiration' from Snapchat lately, and many of its new product launches and features have seemed rather familiar. At face value it has taken a slightly lazy approach to innovation, but I believe it actually reflects Facebook grappling with the same root cause that Snapchat uncovered: fundamental shifts in how people are sharing on social media.
In its early days Snapchat was coyly stereotyped as a way young people shared intimate images with