The issue with articles like this, for me, is that it doesn't quite specify who this will work for.<p>As in, it works for sites that just need a ton of users - but not so much for niche-specific webapps that charge.<p>If you are trying to build a community and need a lot of numbers in a very short period of time, then sure....but if you want to find your users for your specific niche...this advice doesn't quite work.