Filed under: Developer, Social SoftwareFacebook Chat has been a bit slow to catch on. Since it's been relegated to being opened from the web in a Facebook Tab, it hasn't been able to compete with chat services that have their own dedicated clients, like AIM, MSN and Yahoo. Although some third-party apps - like Adium - have made the extra effort to support Facebook Chat, it's not widespread. That's about to change, though, when Facebook adopts XMPP and becomes compatible with tons of existing cha