This new one, "ertooso", is either a highly-sophisticated bot, or a lowly-paid minion that combs through websites and pretends to post relevant replies and then returns a few days later and edits the post to post spammy links. On its first post, in the Emigrated thread, I actually wondered if it was a member who had lost their login information. I visited the thread later, and found that the post had been edited to promote their link. Then the same thing happened in the Star Trek thread in Made in Dale. If you read the original version of the post, it was actually plausible in context. Now, it's been completely rewritten to promote their spammy link.
If it is a bot, the AI is strong with this one. It may even pass the Turing test.
Melkor and Ungoliant in need of some relationship counselling.