> fully-featured APIs and several independent clients As platforms mature, their APIs become more and more restrictive. E.g. Twitter's current API allows only

> fully-featured APIs and several independent clients As platforms mature, their APIs become more and more restrictive. E.g. Twitter's current API allows only a fraction of what it used to allow in its early days. For me the point is that if you use an external platform then you no longer have control over your content; I think it still stands. Stack Overflow is a nice counter example. Then again, all works fine as long as the goals of content authors and the platform are aligned.