It is true. Once you've been on one of these sites, it's like having virtual dog shit stuck to your shoe. This also applies to pages that have only embedded these pages and, of course, at least Facebook demonstrably creates a shadow profile about you without your knowledge if you visit the page without having an account. They are allowed to do this because this page is not an offer, but a tool for intelligence services. However, anyone who voluntarily shows their ID and registers with their real name in order to be allowed to post shit for which they could even be legally prosecuted in the real world probably has no idea how things work anyway.