Facebook has acquired over 80 other companies. Facebook owns Instagram, WhatsApp, Oculus VR, LiveRail, and others, but mostly companies you’ve probably never heard of:
While some of the companies that Facebook has acquired stand alone as their own businesses (ie Instagram and WhatsApp), Facebook is known for buying companies for talent acquisitions, not necessarily business acquisitions. This means that Facebook buys the company in order to access the skills of their employees.