False names, doubtful information, non verified kinships: stay alert. Forgers are on the look out. And much more than we think: 55% of the genealogies published in Internet have serious mistakes, according with an statistic of the Genealogy Fraud Website. Surnames, dates, civil data information, are published without any control. Do we have to believe that all what we read in Internet is true, only because it was published on the web? The incorrect data are not recent; perhaps they remain dragged on there since a long time ago. But every day new falsifications are contributed to the social network. It's recommendable to be aware.