The BBC agreed to a deal with Twitter that means that it’s Twitter stream will now feature embedded video clips – complete with pre-roll ads. It’s an announcement that continue’s Twitter’s attempts to justify it’s financial worth via network partnerships and advertising nous in advance of its IPO. It’s unclear what metrics will be used for the now-far-reaching ad platform, or how it will be monetized – let alone how it will be received by tweeters worldwide. These are big questions that the company will need to answer in the coming weeks before it goes public.