Google Hangout lets you chat and video conference with individuals and groups of up to 10 people at a time.
Here's how you start a Hangout
Select the people you want to have a Hangout with. Here are three ways to find people:
Find people by scrolling through your Hangouts list (same as your instant message list).
Click in the search box at the top of your Hangouts list and type a name, email address, or phone number.
Search for a Google+ circle using the search box at the top of your Hangouts list.
Click the grey check mark next to the person’s name or the circle.
Please note: You must first have clicked into the search box to see these check marks.
Repeat the first two steps to add additional people.
Click the message button or the video call button .
Clicking the video call button will open a new window and send out the invite to the rest of the party. Once they accept the invite they will automatically show up in the conference.