@nite,@mannewalis
Hi, My Cocos2dx version is 3.6. This is what I got while updating SDKBOX and installing Facebook Plugin. Please Check and let me know the solution for this issue. Thank You For all of your Support 
MacBook-Pro:~ Abc$ cd /Users/Abc/Documents/MCocosProject/MyQuiz
MacBook-Pro:MyQuiz Abc$ sdkbox import facebook
|______ | \ |____/ |] | | _/
| |/ | _ |] |____| _/ _
Copyright © 2015 Chukong Technologies Inc. v0.5.6.19
A newer version of SDKBOX is available, would you like to update v0.5.6.19 to v0.5.7.20?
Please type Yes, No or Quit yes
updated SDKBOX v0.5.6.19 to v0.5.7.20 at /Users/Abc/Desktop/2DX/Cocos2dx-SdkBox-Plugins/sdkbox_installer/sdkbox_installer.zip
downloading package sdkbox-facebook_v1.4.0.9.tar.gz
sdkbox instance has no attribute ‘android_set_element’
Installation failed 
/Users/Abc/Desktop/2DX/Cocos2dx-SdkBox-Plugins/sdkbox_installer/sdkbox: line 5: unexpected EOF while looking for matching `"’
/Users/Abc/Desktop/2DX/Cocos2dx-SdkBox-Plugins/sdkbox_installer/sdkbox: line 6: syntax error: unexpected
2nd attempt to install Facebook .Got bellow lines of error :-
MacBook-Pro:MyQuiz Abc$ sdkbox import facebook
|______ | \ |____/ |] | | _/
| |/ | _ |] |____| _/ _
Copyright © 2015 Chukong Technologies Inc. v0.5.7.20
failed to patch file AppDelegate.cpp
Some installation steps failed.
Please refer to the online documentation, for instructions on how to complete the installation manually.
Documentation: http://sdkbox-doc.github.io/en/plugins/facebook/v3-cpp/
Installation completed with errors 
