I noticed a strange entry in my activity log at Stack Overflow. The first one:

predated activity

This is 2011. The funny thing is: I never did that. Even funnier: I registered at SO somewhere in July. In September, I did a tiny revision though:

real activity

So, where does the first entry come from? Is it a bug?

I don't know if this post is related. maybe the developer in question has recently been set free?

  • 3
    That, or you will invent time travel in the future.
    – Pekka
    Commented Oct 31, 2011 at 22:31
  • 2
    I already did, next week. Commented Oct 31, 2011 at 22:37
  • then leave notes to your past self so it doesn't get confused. Look, it's already asked a question about it on Meta Stack Overflow! Be a bit more considerate to yourself.
    – Pekka
    Commented Oct 31, 2011 at 22:39
  • 1
    I don't believe you about next week, by the way. Look at your current situation. Are you going to discover time travel during the next seven days? Hardly likely, is it? The way I see it it's still 10-15 years into the future. Unless your future self in 10-15 years starts messing around time and space, and sends your future self in seven days the blueprints. But that would be terribly dangerous.
    – Pekka
    Commented Oct 31, 2011 at 22:51
  • Yeah, the Swiss neutrino made me a bit overconfident. Commented Oct 31, 2011 at 22:55
  • 2
    Please be more careful in the future. Well, and in the past and present too, obviously.
    – Pekka
    Commented Oct 31, 2011 at 22:59
  • 1
    I'm seeing the same bug. The oldest entry in my activity log is "created ada description", dated 2010-08-30 (nearly a year before I registered), but my only actual activity shown in the ada tag wiki's history is a suggested edit on 2012-01-17. The wiki was created on 2010-08-30, but not by me. I see the same thing for at least one other tag wiki I edited (rcs). Commented Jan 20, 2012 at 0:15

1 Answer 1


We have been battling the activity stream tag wiki stuff for a while now, for example: Tag wiki edits are missing in the activity profile tab

Initially when I designed tag wikis "community user" created the wiki blank and then the end user "revised" the blank wiki. Some people found this confusing so we changed it so the initial revision is a "proper" creation revision however the post is owned by community.

Trouble is this design makes querying for activity very very annoying. We cache an entry in our Posts table for LastEditorUserId, however have no cached entry for FirstEditorUserId.

There was a bug there that used LastEditorUserId as though it was FirstEditorUserId.

I amended the query to properly join into PostHistory to figure out the proper timeline.

Apologies for the confusion.

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