The point of these websites is to have a conversation with people who fit a certain criteria you are looking for, such as gender, common interests, or location, on either video, audio, text chat or any combination of the three. Omegle is completely anonymous, letting you choose entirely what you want to share with others.
It is all in good fun, but some of these websites have more pros than cons. It is a complete random selection, but does let you input interests if you are looking for somebody who shares traits in common.
Cons: For those of you who would prefer to stay on the "clean" side of fun, the nakedness might be overwhelming.
Toss up: Adults only, anything goes as long as it is not illegal.
Among that, Omegle also lets you connect to Facebook if you so wish to.