I wrote something up about this a short while ago, hopefully some of it is some use (I particularly like using the Facebook Ads data to estimate market size - i

I wrote something up about this a short while ago, hopefully some of it is some use (I particularly like using the Facebook Ads data to estimate market size - it's easy, accurate and free): http://contentini.com/web-app-strategy-why-market-research-is-important-and-doing-it-for-free/ http://contentini.com/web-app-strategy-why-market-research-i...