Know About Google Penalizing
Google Penalizing 1.Google has been on a tear penalizing blog networks and guest posting services . 2.Even if you didn't use these services we have seen a ripple effect that can impact websites several links removed e.g. blog network links to site1.com, that links to site2.com, that then links to your site. (Linkweel submission) 3.By being downstream from a penalized website your website can be impacted. Ref. site - https://www.facebook.com/KnowApplication