This evening we got our 171st user for our wishlist-service. When we launched it 1 year ago we tried to get it out on different channels like Reddit and HN without much success, while we _did_ see success in just talking about it to friends and family, and had just over 100 users in January this year. Since then, we've done close to zero marketing, and it's been amazing to see new signups, wishlists and items being c…
Extract out the most popular items that people are sharing (no identifying information connected, only extract out super items that you can identify well, like "Wonder Woman on blu ray"), or similarly build your own curated lists based on what's popular right now (eg a new PS4 game). Build some categories that they belong to ("video games" or "clothing"). Then enable people to quickly browse for things within those segments to add to their wish lists. It should boost wishlist item adding substantially over time and give people new ideas. You could also build a gently curated top 10 or 20 item list in a given week or month (manually reviewed for potentially inappropriate items). You can track various metrics for what's moving socially right now for a link/item to get an improved idea on what matters to provide some further ranking (eg facebook sharing acceleration or deceleration).