Viral Factor, K = No. of invites X Conversion rate
As long as, K >1, your app is growing. And best way I figured out to do that was to make people tweet and make that tweet provoking enough to let her users click on that tweet. Example, I encourage people to boast about number of repins or followers they got because of Pinwoot and tweet reads something like : 1) I got 954 repins on #Pinterest using @Pinwoot. Add your pin here https://pinwoot.com
After 30 days of launch, I managed to get 7000+ active users, about 100 paying users and $6129 in revenues.
My learnings : 1. Build your first main feature really well
2. Dont launch with 100s of features, keep the product simple
3. Make sure to have some influencers on your board as users from day one and make them super happy
4. Use tweet button very smartly - this is make or break up for your side project
5. Dont hurry up into making money, let your users ask you for more feature and then roll out paid features.
Shared here : https://news.ycombinator.com/item?id=5600281