One of Facebook's most underrated acquisitions is Onavo, which it bought in 2013. The company was highlighted in a recent Wall Street Journal report on how Facebook, to maintain its influence over the years, has been vigilantly acquiring or copying potential threats to its own products.
Why it matters: Facebook is notorious for building copycat apps and features in an attempt to stifle up-and-coming social media services, though its standalone apps have largely flopped. A year ago, it made headlines when Instagram, which it owns, released a copy of "Stories," one of ephemeral messaging app Snapchat's signature features. Since there, some have speculated that Instagram has successfully stolen some of Snapchat's users—a problem for newly-public parent company Snap.