Libertarians, is youtube a internet monopoly?

[lewis s]

The reason i ask Libertarians is because Ron Paul, Peter Schiff, Murray Rothbard and other libertarians argue that monopolies are created by governments. Anybody could answer this but i would like to here the answer from a libertarian point of view. Heres is the problem:

When there is a demand for a service or item, many providers will try to provide this service or item to the consumer. When government gets involved, then certain providers are given advantages and become monopolies over the others. When there is a monopoly, quality goes down and prices go up. When there is competition, prices go down quality gos up. (i.e. ipods and the cellphone/mp3 market place.)

SO FINALLY, MY QUESTION IS:

So if there is a demand for social media sharing websites, why aren't there more of them??
Why doesn't youtube have any competition?

I personally find youtube to be a horrible website.... Yes it does have a wide range of videos and easy access to the videos, but the interface and navigating through profiles is horrible. Especially considering how easy websites like Facebook are to navigate. I feel if youtube had competition, then it would be alot better of a website. Easier to navigate through profiles/checking inbox/organizing your home page. Why are there no real competitors to such a successful service?!?