Twitter has acquired TellApart, an advertising platform that facilitates the creation of consumer profiles to better target adverts across platforms (whether mobile or desktop).
What this essentially means is that Twitter is making its advertising a lot more attractive. You should be able to create consummer profiles, with TellApart predicting their behaviours and locations. Implemented with Twitter, this would allow marketers to use real time data to target their adverts more accurately.
This looks likely to be particularly attractive to retailers. It'll be good to see how this all plays out, the deal is said to be closed by 1st June.