Since the specific data isn't publicly accessible, I would tackle this question through estimation. According to their recent quarterly financial reports, they allocated around $10 billion for marketing. If we assume this investment is primarily aimed at acquiring new users, and they added roughly 100 million new users during the same timeframe, we can calculate the cost per new user. Thus, we can compute the total marketing spending divided by the number of new users: $10 billion / 100 million users = $100 per user. However, it's crucial to recognize that this is a basic calculation and overlooks other aspects, such as overhead costs, the possibility that part of the marketing budget may be directed towards user retention, and the fact that some new users might sign up without any direct marketing efforts.