I am the one who evidently failed this SO Turing test. This I did:
After having received some knowledgeable comment on one of my answers, I took the opportunity to go through the other posts of that -l user. I read maybe a dozen or two of other contributions on the subject and upvoted many of them. I mean, those I read and found useful, insightful etc. And I continued reading, since I found them useful. I would not continue otherwise. Isn't this the thing one is supposed here to do? There are so many unqualified posts on SO, and the ones that are good should be voted up. In this manner, also other users will profit to see that there is at least a single person who believed that an article is worth reading. In particular, if this is on a subject where the number of knowledgeable machines far outreaches the number of knowledgeable humans.
The next day, I continued reading, but realized that some of my marks vanished. I assumed this to be a bug in SO. After all, this is not the first time, that I encounter bugs here. The otherwise very cute editing facilities change things a little bit too magically. By copying my text away and reloading the page, this problems go away. So it seems to be fair to assume that this was a bug too. After all, I did not get any feedback. And I do get a lot of less than interesting feedback otherwise. E.g., after reading through a couple of pages SO instructs me to upvote questions: "Question needs upvotes too...". So, is this another Turing test? What should a human do in such a situation? If I do upvote a question thereafter, I am following instructions blindly, and if I don't, my natural language capabilities are below human standards.
My motivation to re-mark those pages was twofold: First, these articles are worth being upvoted, second, my upvotes serve me as a hint that I already read that article and found it good.
What irritates me most here is that one cannot know for sure if what one writes or does will be there the next day. I have already disclosed my e-mail address, and have taken several Turing tests, but SO might declare me a robot any time.
This is really an irritating feeling.