In the menu at the top left corner of the screen, tap "FRIENDS", and then "Invite more friends". If you are not logged with your Facebook account, you will not be able to invite friends to join you.

A list of your friends who have never installed Crazy 8 will appear. Select those that you think might be interested in playing Crazy 8 and click "Send." 

When a friend installs the game you will receive a notification letting you know that you have a new Crazy 8 friend. Don’t forget to go to “My Gifts” and accept your free Chips! 

Tell everyone about Crazy 8! 

If your new friend invites a Facebook friend you both have in common (only valid if you are already friends at the time of installation and not after) to join in the fun, then you both will get a free Gift! 

Simple right? 

What’s keeping you then? Start inviting friends, winning Chips, and having fun!