I've had several unexplained jumps in karma over the last few days, amounting to around 80-100 points. Someone else mentioned the same, and I believe it's happened to quite a few people. If that's a side effect of reverting the votes of systematic downvoters, fine, but if we now have a systematic upvoter, I really don't want to see this. It doesn't have the same emotional overtones as downvotes, but it obscures the signal in the same way.
Another possibility is that a new reader, or more than one, is reading through the archives and voting on whatever they feel voteworthy. That's fine as well.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Notes for future OT posters:
1. Please add the 'open_thread' tag.
2. Check if there is an active Open Thread before posting a new one. (Immediately before; refresh the list-of-threads page before posting.)
3. Open Threads should be posted in Discussion, and not Main.
4. Open Threads should start on Monday, and end on Sunday.