Having worked on a growth team for a few years and where I incremental millions more active users above trend, the underlying techniques are surprisingly simple

Having worked on a growth team for a few years and where I incremental millions more active users above trend, the underlying techniques are surprisingly simple. - implement many different ways you can display the content you have and try to make it relevant - don't display empty pages, try to show the most relevant content you have even if it's not great - if you want people to perform an action (here, adding content), ask them to do it and make it easy :) - send out email or other notifications, giving social context of other people performing the action you want them to perform and with a clear call to action, once again