Google is back with this week's AdWords myths post:
"Myth # 4: The AdWords keyword tool suggests keywords to use
Fact: Keyword tool doesn't make any kind of recommendations about which keywords you should be using. It just analyzes related queries that might be of benefit to you and displays them. It's up to you to decide which keywords you want to include in your account. You should always assess the tool's results in the context of your advertising goals. When you do so, keyword tool can be a helpful way of finding new, meaningful keywords, including potentially profitable ones you aren't currently using and those that you might have excluded as negative keywords in order to protect your click-through-rate."