Have you been posting on MySpace or Facebook? Called anybody names and emailed harsh comments to a list server (including so-called closed or private email groups)?
If so, you may have left a trail that can be tracked right back to you by a potential employer. In an article in today's Globe and Mail, educational reporter Elizabeth Church has written a reminder to teenagers (but the warning is applicable to anyone with Internet access) called Where everybody knows your teenaged musings.
Called a digital tattoo by a headline writer, it's an apt description of how what you say online can remain online forever.