Facebook is still young, and still growing. But they were never in a mood to slow down as far as growth was concerned, even when they were in the midst of becoming a publicly traded company. They purchased Instagram for $1 billion anyway. It was their most expensive at that time and continued to be so, till they acquired WhatsApp for $19 billion in 2014. A deal that’s still considered a high point in startup circles. Since 2005 Facebook have bought more than 50 companies and most of these companies are based in the USA. Here is a list of top 10 companies acquired by Facebook.