https://www.reuters.com/article/us-tech-antitrust-google-facebook/how-a-u-s-lawsuit-claims-google-facebook-cooperated-to-undermine-ad-competition-idUSKBN28Q37G

Facebook Inc and Alphabet's Google, the two biggest players in online advertising, used a series of deals to consolidate their market power illegally, Texas and nine other states alleged in a lawsuit against Google on Wednesday.