AsapChat for Facebook Chat is an alternative solution that will give you alerts when you receive a message in the application, making instant communication easier and more fluid. It also consumes very few resources and has some especially useful functions.
Among its most notable features, you'll find that you can favorite a contact to receive an alert whenever he or she goes online on Facebook. This way you can make sure that your message gets read.
You can also change your online status directly from Asapchat for Facebook Chat, without having to change applications and stop conversations.