Facebook's Messenger just updated and get new feature images annotations or you can draw on the pictures.
To use this feature, you simply call in an active conversation on the integrated pictures and chooses as usual the image to be transmitted from. Instead of sending it directly, you can press an Edit button through which the image can be edited now. Here can be personalized with your finger in different colors to paint things on screen or by entering text (see screenshots below).
The whole thing is about competing Messenger with other apps. So far, the feature can be used only under Android, but the versions for iOS and Windows Phone are likely to be updated with this feature sooner or later.
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