My recommendations for improvement:
- Actions that apply to the whole thread (both question and answer sections) are moved to the top, above the question. Icons (students will only see a subset of these) stand for: Follow, Add to favorites, Pin to Top | Make Private to Class, Flag as Inappropriate, Mark as Duplicate, Delete.
- Most common editing actions (Edit and Attach Files) are clearly represented
- Most common social actions (Follow/Stop Following and Good Answer) are prominent
- Less common actions (History, Filter by Tags) are a click away - see below: