> If you think about what made YouTube, Facebook et alsuccessful, > it wasn't some magic new technology, > it was the right implementation and market acceptance

> If you think about what made YouTube, Facebook et alsuccessful, > it wasn't some magic new technology, > it was the right implementation and market acceptance. I would have put that as the right implementation at the right time many implementations will fail simply because of being too much ahead of time the "right time" imho is not only about market acceptance or market penetration it's also about "when people are ready to accept it". Before google decided to use xmlhttprequest for gmail, nobody would want to use it because it was considered "IE only", but once google used it, it gave xmlhttprequest a certain credibility and then suddenly everyone started to use it and then the word "Ajax" was created. In another context, take smartphone publishing their location in foursquare or whatever, it's not only because they have the technology to do it (GPS), it's also related to social acceptance, after people got used to display their personnal infos on facebook, myspace, etc. then it is just a little jump to accept to display their geolocation. I do believe in "build what had previously not been possible" but it's not only because of technology or market penetration, there is also a big "social acceptance at the right time" parameter.