Crista Cowan has posted an article in the Ancestry Blog that I would suggest be required reading for all genealogists, especially those who are new to researching their family tree.
One of the common errors made by not-so-experienced genealogists is finding a family tree online that “looks like my family” and making an erroneous assumption that it is indeed their own ancestors. I don’t know the error rate of such assumptions but it must be high. I have seem many “family trees” with impossible information, such as a mother giving birth at the age of three or a child born to a father who had been deceased for ten years at the time of the child’ birth. Too many people find a name and a location that “must be my ancestor” and add it to their so-called family tree.
Ancestry.com has added a new Facts View to the Ancestry online tree. The big change in the new versions is that sources to support the displayed facts and relationships are now front and center.
If you use Ancestry.com, you NEED to read The New Facts View: Make Sure You Are Climbing YOUR Family Tree and Not Someone Else’s by Crista Cowan at http://goo.gl/Jum9UJ.