Cam astea se pare ca sunt motivele pentru care au fost lovite siteurile de catre acest update.

Forum spam: This includes comments in forums with exact match anchor text links.

Forum bio spam: Biographies of forum users containing exact match anchor text links.

"Do follow" blogs: Blogs that don't add nofollow to the links posted. "Let's face it," Gabe said. "Being listed on do-follow resource sites can absolutely send Google a signal that you are trying to game links."

Blogroll spam: Watch for blogroll links gone wrong. "Some may be fine," Gabe said. "If you are unsure which ones are bad versus good, ask for help from a seasoned SEO."

Spammy directories: If you've used spammy directories in the past, and still have links out there, Gabe said "nuke them, have them nofollowed, or disavow them."

Blog comment signature spam: Google seems to be targeting these links even when they're not followed, Gabe said.

Google Penguin 2.1: Who Got Hit? - Search Engine Watch (#SEW)