it appears that the activity feed on each user’s profile shows only topics created, replies, and when their reply is marked as an answer. It’d be good to add in other “events” from the activity as well, particularly the gamification milestones. 

• Earning a badge
• Earning a rank (show for moving up only)

I’d also love to see: 

• Voted for an idea
• edifferentiate topic creation in this feed between question/conversation/idea]