I don't get how new posters dig through thousands of threads to ressurect an old thread from years ago. Usually just 1-2 pages long. I always think they have some nefarious reason to comment on those specific threads. Not sure what...
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Usually new members arrive here because they've googled something specific, like "my wife cheated on me, what do I do?". This brings them to TAM, and more often, directly to a specific post on TAM that hit on whatever their google search string was. They read the post, want to respond, create an account, then away they go. And voila, zombie thread resurrection!
I trust the mod's judgement (though it might not appear that way), and Elegirl's motives are sound.
That said, I've seen a few that seem to get locked simply because they're old. The other day, a zombie thread popped up, and even though I knew it was old, I started from page 1. Got all the way through, the thread had remained relevant and the subsequent "new" posts were still on topic and current, but it got locked.
I get it when somebody posts advice to the OP on a thread that is 2 (or 3 or 6) years old, but there's often a lot of zombie threads that pop up and the newer responses are simply a continuation of how the thread went, often with interesting discussion. Those are the ones that I don't feel should be locked simply because post #1 was from 2009 or the last post was a year ago. They're organic and can still be relevant and interesting.