There's a great downside to specialized integration, and that's flexibility/robustness.
Create an integrated facebook/twitter interface and the next time the backend interface / protocol of those services changes, the software on your console brokes until it's updated. A web interface is always up-to date, as the web browser just has to be coded to the HTML/JS/Flash standards and not to the single services specs.
Frankly I'd prefer to have a web browser that works with things such as gmail and even lets me check my incoming google-office documents or Picasa albums shared by my friends, rather than waiting for the console maker to provide me with interfaces to the services I want to use.
I agree that any form of integration would need to be managed and one would hope that any large integration such as the Facebook type would not just break. Of course the web browser is a form of integration and also suffers from the same issues i.e. Flash upgrades the like.
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