Once you have Facebook Messenger added to Messages, you will be automatically logged into Facebook Messenger when the Messages app opens. If you’re on a Mac, the ability to have Facebook Messenger conversations right in the Messages app of OS X is really quite nice, the conversations will appear alongside other text messages and iMessages, Google Chat, Yahoo Messenger, or AOL / AIM communications. Message anyone in the list as usual, the conversations are going through Facebook Messenger.Ignore all other settings and choose “Create” – this will setup Facebook messaging client and in a moment you’ll see your Facebook Friends list populate as a buddy list, complete with friend names and friend profile pictures.In “Account Name” enter your Facebook account user name as follows: (a Facebook username is whatever your Facebook profile URL is, for example: ‘the username would be “your_name_here” and the account name would then be Enter your Facebook account password in the password field, this is the same one you use to login to Facebook from the web or the apps.Pull down the menu next to “Account Type” and select ‘Jabber’ from the list.From the message account screen, choose “Other messages account…” and click on “Continue”.Pull down the “Messages” menu and choose “Add Account…”.Open the Messages app on the Mac if you haven’t done so yet.This basically turns your Messages app into a full fledged Mac Facebook Messenger client, you’ll be set up in just a few seconds with these instructions: How to Add Facebook Messenger to Messages in OS X

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