Dubious Links

According to Google, backlinks from low-quality directories can lead to a penalty.Lots of links from sources commonly used by black hat SEOs (like blog comments and forum profiles) may be a sign of gaming the system.

Articles directories and press releases have been abused to the point that Google now considers these two link building strategies a “link scheme” in many cases.

Google frowns on links that are automatically generated when the user embeds a “widget” on their site.