Per Gwern[0]:

> (...) There appear to be several similar AI-related leprechauns: the infamous Tay bot, which was supposedly educated by 4chan into being evil, appears to have been mostly a simple ‘echo’ function (common in chatbots or IRC bots) and the non-“repeat after me” Tay texts are generally short, generic, and cherrypicked out of tens or hundreds of thousands of responses, and it’s highly unclear if Tay ‘learned’ anything at all in the short time that it was operational;

[0] https://www.gwern.net/Leprechauns, self-recommending

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