It’s the bane of any genealogy research. Finding out you have incorrect information long after you’ve added it to your family tree. In the worst cases, this could have ended up with you researching the wrong line for years. Fortunately, I’ve never (at least not yet) had that issue.
While I love Ancestry.com with their user-submitted family trees and I have used it constantly in my research, it’s a double-edged sword, especially for newer researchers. I sigh and roll my eyes every time I see their television commercial that shows a woman who notices the “shaky leaf” on some of the names in her family tree. When she clicks on them, she is able to add whole new families to her tree. Unfortunately, it seems most people think it’s that easy. Just click and boom, all your work is done.
I admit that in the beginning of my research over ten years ago, I usually just went for quantity over quality. It was so exciting to find new people and information that you just added it. I’ve paid the price for that now, but fortunately not in any major way. I’ve just had to go back, change a few pieces, and re-find all of the sources. That has actually indirectly helped me find new information, since now I look closer at every source I find.
I can use my great-great-grandfather’s profile to prove my point.