Should we break up monopolies (more than 50% the market), including more than one corporation that acts as a monopoly?

Should we break up monopolies (more than 50% the market), including more than one corporation that acts as a monopoly?

Mainstream media may be half dozen corporations and although they may bicker about minor things that get the public hot and bothered, when it comes to supporting the federal government, they speak as one voice. To truly have a free press, should they be broken up into a thousand pieces?

If Google has over 50% of the search engine market, they are a monopoly.

If Microsoft has over 50% of the operating system market in United States, they are a monopoly.

If Twitter, Facebook, and YouTube has over 50% of the market and they all censor the same information, they are a monopoly.

If Visa, MasterCard, and PayPal have over 50% of the market and if they all cancel or refuse merchants accounts from the same individuals or companies, that they disapprove of, even when legal, they are a monopoly.

Should we break up monopolies (more than 50% the market), including more than one corporation that acts as a monopoly?
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