Dudley Wong the product manager announced that Yahoo! will soon open up the platform behind the popular Yahoo! Messenger service. This is big news. If you havenâ€™t used Yahoo! Messenger, youâ€™re in for a treat. Yahoo! Messenger is the premier instant messaging (IM) platform, used on a wide variety of desktop and mobile clients. Millions of users throughout the world already depend on Yahoo! Messenger to manage their social contacts, group lists, and presence information; hold real-time instant communications; and perform data transfer to and from contacts throughout the world. All, well â€” instantly, as its name says.