Hello, My website is opcionesbinarias10 . com , in the past i buy in this forum some likebuilding services that say that was WHITE HAT SEO, after the hummingbird update of google my site lose a lot of positions in the ranking.... The best position for my site for the most important keyword "opciones binarias" was 4th... now i think i am 70... or more... I think my site was penalized...how can i know if is truth? should i delete all the bad backlinks?