If you find your personal data, ask the site webmaster to remove it. Hopefully you will not have to be too forceful. If you have a personal web site, do not post the personal data of others. Names are usually acceptable, but dates and other information regarding the living is not. This can be a tedious task if you have a large database.
Utility software is available to help.
Try downloading a copy of GEDClean . I hope that this has shed some light on this complex subject. It was not meant to be anything but a catalyst to thinking. Please email me with your comments. As A Research Tool Communicating with other family researchers is key to any genealogical quest.