Couple of "bugs" still need sorting out ~ history is random presentation, not in order of conversation Sometimes you cannot see what you are typing in the send window and the delete option does not work. However it works and compare that to a few months ago when there was no Yahoo messenger and the alternatives did not work at all.
Does what it says on the tin, enables you to chat with other friends on Yahoo messenger.
Bugs I have found are that after a few minutes, the text you type vanishes until you tap the text bar, and then when you carry on typing the text vanishes again. A restart of the app usually fixes it until it starts again. Also I have trouble if chatting on the Kindle to a person using a non Kindle device such as a laptop, there is a huge time gap and even some messages vanish.
On the whole good when it works but is prone to acting up at times.