You should approach this on a case to case basis, depending what your site does and what is actually needed. Having built many services before, I've always chos

You should approach this on a case to case basis, depending what your site does and what is actually needed. Having built many services before, I've always chosen what is right in that case. If there is data & content to show before registration, go for it. A public photo/video site like Youtube would be very different from a hosted e-mail provider like Gmail. In Utopic case, there is very little to show the user otherwise, as a lot of what we have built is based on Facebook API data. We could have longer about pages, screenshots etc, but that would be it. Many have asked us for other registration/login methods (e-mail registration, Twitter etc) but for us what you would end up with would be an empty site, resulting in disappointment.