Quite a few seem to. I find Yahoo best for one-on-one, which is what I prefer. With the person-to-person voice feature, it is especially hot. LPSG video chat is good for general exhibitionism, and I jacked off there for the first time today, since no partner was available on Yahoo when I was looking for one.
Get yourself a cam if you don't have one (they are real cheap), and give it a whirl! Add me on Yahoo if you find me worthy.