How reliable are the facts you find?
Some genealogical facts you find can be unreliable. According to Answers.com, the top 5 unreliable sources are:
1. Place Names
2. Occupations
3. Surnames
4. First Names
5. Dates
(In order from most reliable to least reliable)
Answers.com gives the reasoning behind this list, and all the reasons make sense. This is why it's important to reference all your sources and be as thorough as possible.