Yet another google ranking update had been reported, mainly to target spam links, last time that this has been reported was in early feburary , here is more info from searchengineland.com:
“Since yesterday morning, the SEO industry has been watching an unconfirmed Google ranking update that seems to target more of the link quality aspects of the overall algorithm.
Many are calling this the Fred Update, a name we’re also adopting. That came from Google’s Gary Illyes, who has jokingly suggested that all updates be named “Fred.” It’s sticking with this one.
We’ve seen more chatter and reports of changes from within the “black hat” SEO community, which generally means that this is a spam algorithm update around links. Last time we reported a link spam-related update was in early February, and that update also was unconfirmed by Google.”
Google will keep getting smarter and SEO “black hatters” will keep trying to “out smart” them.