 In return, the users running Megakey agreed to supply some personal identification and demographic data and to allow the substitution of ads on third party websites they visited with those of Megaupload.Megabox, a new form of media downloading site, was the first of its kind.Kim "Dotcom" described Megabox as "very similar to iTunes" except that it operated in a web browser using HTML5 technology and loaded "much faster than iTunes or anything else out there".