I kinda get why you'd want this, which leads to my next question as it's been about 6 months since I used My Updates. When you post something on one of those unanswered question, do you get a separate "update" for each comment, or does it just supercede the one before it?
Say Example1 commented three days ago. You see this in your updates. Example2 commented three hours ago, does it still show the update from when Example1 commented, or does the comment from Example2 erase the other one?