This is a unique method that MailOnline used, to targeted their recruitment ad precisely to SEO techies.
The newspaper embedded an ad in its robots.txt file, a place there is no reason for any human to look. This is a file strictly to be read by the crawlers from search engines. It tells them what pages to index and what not to. For normal humans, there’s nothing of interest there, as you have may already have discovered if you clicked the link.
Full Story from ere.net.
The ad says,
# August 12th, MailOnline are looking for a talented SEO Manager so if you found this then you’re the kind of techie we need!
# Send your CV to holly dot ward at mailonline dot co dot uk