Facebook’s DNA is that of a social platform addicted to growth and engagement. At its very core, every policy, every decision, every strategy is based on growth (at any cost) and engagement (at any cost). More growth and more engagement means more data — which means the company can make more advertising dollars, which gives it a nosebleed valuation on the stock market, which in turn allows it to remain competitive and stay ahead of its rivals.

[Source: The #1 reason Facebook won’t ever change – Om Malik]