This article in the Wall Street Journal by Greg Ip shows what a case against Google and Facebook on antitrust charges would look like. He says Standard Oil and American Telephone and Telegraph had over 80% of their market. Ip points out that Google and Facebook's share is 89% and 95%. Here Ip shows that there are secondary effects beyond innovation by such Tech companies and Amazon which restrain competition and could be grounds for antitrust action. These companies favor their own products and skew their algorithms to promote them, making it difficult for newcomers. Also providing less access to venture capital that prefers not to invest in the newcomers that compete with the dominant tech companies.
Original article 14 minutes, gist 1 minute