I have noticed that users do some activity somewhere and their last seen is not updated according to it. For example, they comment on a question a minute ago but their last seen will be like ~15 mins ago.
Can the last seen be updated as the user:
- Requested his achievements (clicked on the recent achievements)
- Requested for inbox (clicked on the recent inbox messages)
- Opened any question
- Clicked on the list of Stack Exchange sites (Button on the top right corner)
- Requested the new questions (clicked on X new questions with new activity )
- Commented somewhere
- Answered somewhere
Though this list won't be complete, it looks bad that the user did that activity right now but the profile says he was last seen a long time ago.