Summary (it is all a little meta for me): the reddit link above started as a fairly innocuous reddit thread comparing the sizes of the two books "Javascript - The Definitive Guide" and "Javascript - The Good Parts" - the Good Parts being a good deal smaller as the linked photograph illustrates.

Some wise guy decided to have a little joke, and posted a comment instructing people to copy and paste a snippet of Javascript on their URL location bar. A lot of people (presumably "web programmers") did as instructed. That little snippet posts a comment on that same thread, instructing the next person to do the same. That entire reddit thread is overrun with those script generated comments.

Social lesson: we are fked as far as security is concerned, if that reddit thread is any indication: even programmers would sheep-like do as they are instructed. I suppose that was the "lesson" the wise guy had in mind.

Some good samaritan posted another Javascript snippet to clean up the reddit thread - automatically downvote the spam comments or hide them.