If you are a Google Apps business user you should look at Hangouts, formally know as Google talk.
Google Hangout is a great communication tool for small business, with feature of instant messaging, voice and video calls.
Whether you want to message a friend or a group it is easy, with up to 100 people in chat groups it is sure to suit most businesses. Turn any voice conversation into a video cal for up to 10 people at once.
If you are always on the move then it work on Android iOS and the web.
It's simple to use and navigate
It can also be used with google chrome and Firefox with a simple install of the plugin.
Get Google Hangout Plugin from here...
Let me know if you have used Google Hangouts and what you think!