Now you have more options when it comes to choosing your teammates. In addition to partying with friends, you can now view and join lobbies created by members of the Steam Groups you belong to. Steam Group Lobbies will be listed in the Steam Groups tab on the Main Menu

Create a group that reflects your CS:GO interests, or join one of the thousands of Steam Groups representing various communities, countries, languages, and common interests.

For more details on Steam Group Lobbies, click here: Steam Group Lobby FAQ

How does it work?
CS:GO Update 11/29/2016