Old Navy gives us a great example of a simple word of mouth promotion you can produce in less that 2 hours with zero budget.
1. Create a simple offer. Old Navy offers 20% off you say the secret code word ("BFF"). They created a single graphic that explains everything.
2. Make it a group activity. The code is good for you and a friend. All the copy encourages you to bring someone else.
3. Make it easy to share. They put up a quicky Facebook event page. At least 10,000 people have received the invitation. (Link)
Lesson: Word of mouth is really easy. Don’t let politics, budgets, or technology get in your way.