It can also be a problem in business apps where developers don't consider the restrictions on a network. I have regularly seen apps link to third party social

It can also be a problem in business apps where developers don't consider the restrictions on a network. I have regularly seen apps link to third party social network libraries synchronously. The problem is that corporations will routinely block things like Twitter. You have to wait for the connection to timeout because the domain is blocked. Also http connections are often closed prematurely by proxies and firewalls and can take seconds to restablish. Apps will often lack sufficiently robust keep-alive so the user will suddenly have an unreposive site.