Facebook / Riya: Should be working together

I really like the photo-tagging implementation in Facebook but manually tagging a large quantity of pictures is boring. I think that Facebook should integrate Riya's technology to auto-suggest tags on photographs.

Facebook would benefit from better usability and more tagged photos which would drive community. Riya would gain a high profile customer which could help the technology gain mainstream credibility.

The barrier to getting this deal done is probably Facebook's business model. Licensing Riya's technology would not necessarily increase its inventory of pages to drive advertising revenue so why license the technology? How do you justify the ROI on the investment?