Once you do, you'll also be able to send files and create group video calls.
Or, if you're looking for more of a one-on-one messaging service, see this Apps for Free Video Chat on Your Computer list.
The grandfather of chat applications, Instant Messenger was first introduced on AOL's online service and then expanded for use across the internet.
See when your buddies log on and send them messages faster than the speed of email.
Tinychat is a good alternative to some of the more popular chat rooms in that there are multiple safety settings and a clear effort to keep Tinychat clean.
When multiple people are broadcasting their video, you can see all of them in a smaller thumbnail in the middle of the screen, which makes it super easy to see everyone at once.