I agree with tolstoy, (I didn't remember you being a right winger like me).
I think the easiest examples of new modern monopolies are facebook and google. Facebook is essentially a monopoly on social networking. Now facebook isn't a complete monopoly, but competitors (google plus) have tried to enter the market. Was googles, failure to compete with Facebook because of too little or too much regulation? Or was it simply that people preferred Facebook?
The fact of the matter is 6 years earlier Facebook was competing, and losing, to myspace for the social networking market. Facebook won and deserved the monetary gain that resulted from that victory (Zuckerberg being the youngest billionaire in history). We shouldn't punish Zuckerberg for the innovation, creativity and success that he had with his product, and we don't need to regulate facebook in anyway.
Lets say facebook, being the monopoly that it is, decides that its advertisement revenues are too small, so they decide to start having people pay if they want an account, then people who don't want to pay would leave, google plus would probably get a lot of new members.
This is the reality of the monopoly that Schumpeter described. If a monopoly becomes too inefficient, or raises its prices by too much, then a different entrepreneur will enter the market an start competing with said monopoly, with a competitive advantage of a lower price or more efficiency.
I cannot think of a monopoly arising because of too little regulation because in a genuine free market the only way to make a profit is to sell a product that consumers are willing to pay more for, then the costs associated with producing said product. If you gain a monopoly because your selling a product that consumers want at a fair price, then there is no need to regulate you, and as long as there is no regulation, there is only one other way to create a monopoly.
The only other way to create a monopoly is to invent a new product and be the only person selling it. At the start up you will have a monopoly on that product, but if consumers want it enough and your profitable, then people will start competing against you.
In this exact case the only way to maintain your monopoly is if you have patents or copy right regarding this product. In this case your monopoly is the direct result of regulations preventing people from competing with you.
The final way to create a monopoly is to buy out all of your competitors, the problem with this is that to do this you will have to buy your competitors for more money then they are worth, meaning that this decision will actually cost you money, not make you money, and as long as there are no barriers to entry, if you start becoming too inefficient or charging too much, then more competitors will arise, meaning that in a genuine free market, this monopoly strategy would actually bankrupt the monopoly.