There are parts of my tree that I'm not certain about, and I wish someone else would point out the errors, but like the others, I have lots of people who have copied stuff off my tree and some of it is the stuff I'm not 100% sure about. I have made notes on it saying that I'm not sure, but they still copy it. Just be certain of your own stuff, always check the original records (where you can) and if in doubt, make a note to say that you're not sure its correct. Let everyone else get on with making mistakes!