The people in those companies that Facebook bought are not just engineers, they are also people who can see a gap in a market and create a good product to meet

The people in those companies that Facebook bought are not just engineers, they are also people who can see a gap in a market and create a good product to meet the need. They are not typically the people that apply to for jobs, especially at facebook or respond to head hunter requests. I can see why facebook needs to buy companies to get those people. I can also see why they often leave again, since they can't get things done that they want to, in big organisations.