Fran, not sure what you mean by "compromised" but all you have to do is change passwords and set up more secure settings. Once your password is changed, you are good to go.
On the "more secure settings," be sure to go to Account > Privacy Settings and then go through all the settings to make sure they're what you want.
For example, I have everything set up as "Friends Only" except for stuff like "Search for you on Facebook," "Send you friends requests," and "Send you messages" which I have set up as "Everyone."
Be SURE to go to the "Apps and Websites" link at the botton left-hand side of the page and consider disabling the "Apps you use." Having Apps enabled allows others to see information about you when your friends use the apps, regardless of whether or not you use them.