what is phantom google update?

[updatepedia]

what is phantom google update?

[StuartSpindlow]

After many reports of large-scale ranking changes, originally dubbed "Phantom 2", Google acknowledged a core algorithm change impacting "quality signals". This update seems to have had a broad impact, but Google didn't reveal any specifics about the nature of the signals involved.

[jane1]

It is confidential and not made public by the search engine team