I sort of like the Drip widgets (http://getdrip.com http://getdrip.com) and there exist numerous Javascript things which can do roughly the same. I don't have

I sort of like the Drip widgets (http://getdrip.com http://getdrip.com) and there exist numerous Javascript things which can do roughly the same. I don't have much experience with physical products and am not sure this generalizes, but in SaaS, one of the best ways to get opt-ins with advertising is to: a) Send the ad not to a landing page but rather to content pitched in the ad b) Have a further incentive which takes the piece it's attached to and deepens it. Gate this one with an email submit. c) You generally want to get to a state where you have N content pieces, M creatives for the premium (downloadable whitepaper or whatever), and P premiums, where N >> M >> P. Then you can start testing to find which ads/content/house ad creatives/premiums get you the best results. It works perfectly adequately with N = M = P = 1 though. This works particularly well with retargeting. You get someone to visit your site once or a few times organically (your content was on HN or Twitter or what have you), you cookie them up, and some day when they're browsing Facebook your company (which they already trust to give them useful info) says "Hey, more stuff for you to read of interest to you." They come over, read for a bit, and hand over the email address semi-casually. Your marketing and sales processes now take over.