Twitter Inc (NYSE:TWTR) users can freely type up direct messages now as the micro-blogging site just dropped the 140-character limit for private conversations. The limit still remains in effect for standard public messages. The website's product manager, Sachin Agarwal, believes the change will make sending private messages more personal and fun. Twitter wants to encourage users to send direct messages In a recent blog post, Agarwal explained that Twitter is primarily a public and social experience, but direct messages enable users to share thoughts on news stories and events... More