I would focus more on user retention right now, if you can get those 100 users to come back again and again then you are most likely onto something. The more y

I would focus more on user retention right now, if you can get those 100 users to come back again and again then you are most likely onto something. The more you can learn about your users now, the better. Plus the more your users are engaged, the more likely they are to invite their friends to your service = free distribution. Congrats on your initial traction!