I love it, especially how you summarized the key points in one or two sentences instead of going into lengthy stories.<p>It seems the key strategies can be listed as follows:<p>1. Great video which demonstrates a good knowledge of the community (Dropbox)<p>2. Viral (aka sharing) features built in (Instagram)<p>3. Leveraging existing userbase (Instagram, Product Hunt)<p>4. Exclusivity (aka invite only) (Spotify, Facebook, Quora)<p>5. Reaching out to competitor's users and doing a better job than the competitor (AirBNB)<p>6. Getting the tougher side of the marketplace on board first (Tinder)<p>7. Offering rewards for signing up etc. (Paypal, Yelp)<p>8. Starting with a premium service first to deliver best user experience, leading to word of mouth (Uber)<p>9. Contests (Youtube)<p>10. Influencer outreach (Etsy)<p>11. Seeding site with good content (Quora)<p>Do continue with this site. I find it to be a very valuable resource.