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Like any other social media site Facebook has length requirements when it comes to writing on the wall, providing status, messaging and commenting. Understanding how many characters you can use, enables you to more effectively use Facebook as a business or campaign tool. Private messaging is one of the main ways that people interact on Facebook. This type of direct messaging can be either an instant message (chat), or a regular email-type message. For both instant and regular messaging, there is a 20,000 character limit.