Fascist regimes typically offer big business a deal: business gets low taxes and protection from labor unrest and nationalization, but agrees to accept direction (some of it arbitrary) from the government, and to remain silent on political and social issues. Historically, the deal has been accepted, particularly if the threat from the left is viewed as being substantial and credible.
Does this sound familiar? It should. It is roughly where the Trumpist GOP is today.
American fascism would, of course, particularly impact the tech companies, of whom the right is extremely critical. Ironically, the imposition of government censorship of the left would resolve the free speech issues that currently bedevil Facebook and Twitter; they would consequently be free to pursue their business models without further interference from the government. The fascist government, having accomplished its objective of shutting off political debate, would have no incentive to break up the tech companies, which would probably be viewed as national champions in dealing with China and Europe. Censorship, however, would silence both outrage machines; the left would be outlawed, and the right would thus have no reason to exist. As a result, the social media companies would be forced to return to their original concept of uniting the world through cute cat videos, and their profits would be reduced accordingly.