Ryan Sarver, who spent about four years running Twitter’s platform is joining Menlo Park, Calif-based venture capital firm, RedPoint Ventures. He left Twitter in May 2013. As a partner with the fund, he is going to focus on investments in social applications, social platforms and software-as-a-service startups. Prior to joining Twitter, Sarver worked for Boston-based Skyhook Wireless and had founded a startup called BlueTrim. He is part of a growing posse of Internet executives who are gravitating towards venture capital investing at a time when the industry itself is going through sea change, due to evolution of technology business and changing regulations.