As someone else have mentioned most of these connections are progressive connection. Another thing to consider is their CDN usage. Facebook uses Akamai as their

As someone else have mentioned most of these connections are progressive connection. Another thing to consider is their CDN usage. Facebook uses Akamai as their CDN of choice, most large to medium size telco/ ISP has their own Akamai Cache server at their NOC. So latency is not issue for the big files (images and JavaScript) after the initial reload, assuming they are not cached on the browser already. So no matter how many connections are made when visiting facebook, it usually loads fairly fast because of aggressive caching and progressive connections. Most of the time the end user shouldn't be able to tell the difference.