We've mentioned one of these before, but it's worth repeating.
Be careful what you discuss on your Google account. If you review shoes, music, or anything else on Google+, YouTube, or other Google services, the search giant reserves the right to use your name, profile picture and writing in search results.
Yes, Google wants you to help sell products. Not interested? Click through for instructions on how to opt out.
Noticed strange Gmail activity lately? Google+ users with Gmail accounts can now receive email from anyone who follows them. Yes, anyone. More details can be found here. We haven't discovered an opt-out feature yet. Be warned.