> How come I can't access messenger with a 3rd party app?
Can't you? Adium claims it supports FB: https://adium.im/
Can't you? Adium claims it supports FB: https://adium.im/
Can I?
What's the problem here?
The Graph API has not longer the ability to retrieve the /home endpoint which contained the newsfeed, since v2.0. The only this a app can retrieve is the user's own posts.