I believe they do not work.... that said, I think they can be part of deluting the mix percentage of high profile backlinks. Too many of those top backlings (only) are not good either.
If you put a link on your PDF, it would not give much effect on keyword rank. but if you place you PDF (and your site link) on High Authority Site, it will bring a good quality backlink.
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.