I've spent many frustrating hours in recent days, searching for my 2nd great grandfather, John Day (d1842 or 1846 in Wisconsin). Problem is this wonderful digital age that provides us with tremendous resources also is providing a blizzard of bogus data naively posted by genealogists who leap to convenient assumptions and don't document.
I'm finding pedigrees that report my John married to the wrong women in the wrong state and siring children from the grave! I've found one pedigree that appears to have a mother giving birth to a son and then marrying him and having children by her son!
I'm sure I've made some mistakes too; but some of what's going on in cyber genealogy is just ridiculous.
Document. Document! DOCUMENT!!!