When using the social course format along with the social activities block, the old dropdown menus are displayed rather than allowing for the activity chooser. This is caused by the social course format not implementing the supports_ajax() function.

Steps to reproduce:

1. Create a course using the social course format.
2. turn editing on
3. If not present, add the social activities block
4. try adding an activity in the social activities block, you will see the moodle 1.x series drop downs rather than the activity chooser.