Those 4,100 people are not just facebooking all day. The question isn&#x27;t whether they produced anything - it&#x27;s whether it is actually needed to run twitter. And personally, I believe the answer is &quot;not really&quot;.<p>As an example, they could have gone with Zurb Foundation instead of doing Bootstrap. They could have used (redo, cmake, tup, a hundred of other tools) instead of doing Pants.<p>If Twitter was non-profit, their breadth of products would have been awesome. But it&#x27;s for-profit, and most of these projects are negative on the P&amp;L summary, even if you favourably take into account intangibles like &quot;help in recruiting people&quot; and &quot;coolness of brand&quot;.