Facebook revealed today plans to acquire LiveRail, a supply-side advertising platform for video content. LiveRail will help Facebook make video ads “better and more relevant” for viewers and publishers. LiveRail boasts a number of top clients, including MLB.com, Condé Nast Digital, CBS Interactive, ABC Family and Univision. Facebook officially_rolled out premium video ads in March, following limited tests late last year._In May, the company expanded those ads internationally to Australia, Brazil, Canada, France, Germany, Japan, and the UK.