The absolute most common PPC mistake is actually rarely talked about. It never makes the top 10 mistake lists; and it’s usually pointed out by someone else – in this case via Twitter.
A special thanks to Robert Brady & Sam Owen in reminding me to check these mistakes.
If you use one of the editors (AdWords or Bing Ads) to import keywords, mass create ads, etc – you always have a header row in Excel to remind you of the columns:
