First it was the newsfeed. (which Twitter pioneered)
Then it was the push towards being more open and public. (like Twitter)
Then it was a subscribe button, which then changed to a follow button (like Twitter)
Then it was lists. (like Twitter…and Google+)
Then it was interest lists (to mimic the interest graph, that Twitter does so well)
Then it was hashtags (another staple of the Twitterverse)
Then it was the creation of a short video sharing app (Vine vs Instagram)
If you really want to see Facebook’s playbook, just watch what Twitter is doing.
I may have the chronology of Facebook feature releases wrong, but you get the point. They all came after Twitter.