Conferencing online with voice is not only a great and productive tool for business. It can also mean a lot of fun for friends to get together. It can also be fun to join online conferencing groups to meet new people who share interests similar to yours.
Think about it like a chat room, but with voice! In the past you could call by phone to the so called "party lines" to conference with people from all over the country. Now, online, you can enjoy conferencing with anyone in the world, that includes people who don't even speak your language (if you enjoy that sort of awkward communication).
The best part about this online conferencing frenzy is that it can be done for free if you wish. There are some really interesting programs out there that let you connect to online conferences on many given conferences for free. Of course, these types of services aren't regulated, so you might expose yourself to different forms of risks.
On the other hand, there are some cheap conferencing services that let you have all the online fun without having to worry too much about vicious hackers. Either way it's always a blast to enjoy the times and all the technological entertainment that comes with progress.