If you've ever contributed to a public group or a discussion forum on Facebook, your comments may very well end up in the Google and other search engines results.
If you want to see what people are saying on a particular topic, just copy and paste the following line into the google search box and add
site:facebook.com/group.php "word or phrase you're looking for"
For example,
- site:facebook.com/group.php "credit crunch"
- site:facebook.com/group.php "Macdonalds"
- site:facebook.com/group.php "The Dark Knight"
Alternatively, you can use Google Alerts to monitor what people are saying as it happens