I noticed that there are no downvote notifications in the activity stream.
Out of idle curiosity I wanted to have a look who else downvoted SAP Standard ABAP Class for User Management?. Couldn't see anything. Dug deeper, can't see a single downvote anywhere.
If it's deliberate, then why display upvotes and hide downvotes? I don't think it should be hidden. For the record, I even provided a reason why I downvoted it - I think this should be done more often.
In general I think it should be easier to see who up/down/liked a question/answer/comment.