1) Create Google alerts for relevant keywords and if it's a blogger, leave an useful comment with a link to your blog at the end. 2) Create Twitter searches to

1) Create Google alerts for relevant keywords and if it's a blogger, leave an useful comment with a link to your blog at the end. 2) Create Twitter searches to find people with the problem your product solves, and tweet them your solution. 3) Establish yourself as an expert in relevant forums and leave a link in your forum signature. Connect with other forum members. 4) Do giveaways in relevant blogs. Tie the giveaway to your web app in a creative way. You don't necessarily have to giveaway a premium plan of your product - it could be another product, or an Amazon gift card. Protip: I know from experience that doing a giveaway > $100 and posting in in online-sweepstakes.com will yield over 100 0 visitors in a day. Give more entries for retweets, facebook likes, etc. 5) Guest blog posting is easy low hanging fruit. 6) Do cross partnerships with another startup. 7) Find a similar new product in your space. Search Google news for stories on that product. Pitch your product to those same writers. Make sure you develop a relationship before that pitch. 8) Encourage existing users to share it through email. Give them call to actions.