Honestly, if you value the content you create and put online, then you need to be in control of your own stuff.
A truly excellent article outlining the difference between share-cropping and self-hosting. It may seem that the convenience of using a third-party service outweighs the hassle of owning your own URLs but this puts everything into perspective.
This looks like it might be worth investigating as one potential solution to the sharecropping problem: code for decentralising your data; you allow apps to access your data but you get to decide where that data lives. Intriguing.
A comprehensive look at some of the problems with taking self-hosting to its logical conclusion: running your own web server.
Yet another reason to host your own content instead of sharecropping; danah boyd wakes up one morning to find her Tumblr account has been moved to a different URL.