Roku worked with Facebook on this channel. They(Roku) were actively soliciting feedback on it when they announced it in July 2011:http://blog.roku.com/blog/2011/07/08/ne ... o-channel/
...We’ve worked with Facebook to significantly improve the experience of finding and viewing photos from Facebook, and as the channel name suggests, we’ve also added video support....
If you have comments on how to further improve the Facebook experience on Roku, write the product team at firstname.lastname@example.org
. We’re listening.
I can't answer definitively, but I expect that the principal issue arises from how Facebook's API interacts (or fails to interact) with the Roku device. The Facebook API is primarily designed around a web-browsing/mobile app experience, and devices like STBs, which don't have advanced interfaces, suffer usability issues (such as the unclear multi-option permission box) as a result. Still, clearly, they could do better communicating what the necessary requirements are for.
For reference, the linking/access API for devices is described here:https://developers.facebook.com/docs/au ... n/devices/
Facebook states there that the API is still under testing with a limited number of device partners, and that it is not available for general use. Issues like the one described here are probably part of the reason why it isn't widely available yet.