I want to clarify something about Frienditto that I think some people don't understand. If someone's name shows up on the
ditto_cops list, it does NOT mean that they signed up for the service. If the name of one of your friends shows up on the list, first check and see if the post was friends-locked or not. If it wasn't - if it was a public post - then you shouldn't have anything to worry about. No access information is given to Frienditto in order to add a public LJ post to their 'archive service.' Your account is not at risk, nor is the person whose post is now on Frienditto. And from looking through a lot of the posts on there, it's not people archiving their own journals (which I think it was supposedly intended for, but who really knows...). It's other people - usually an 'enemy' - posting to try and embarrass the person whose post was logged. So don't rush to defriend people just because their name shows up. Look into the situation first.
If, on the other hand, the post you find was a f-locked post, then I would recommend contacting that person immediately. They may not even know about it. If they didn't post it, they need to check their f-list very carefully. If they did post it, not realizing the consequences, they should probably change their LJ password. And defriending at this point would be totally understandable.
I *think* - I haven't checked into this to be sure yet - that posted that are *filtered* should still only be accessible to the people on that filter, giving you a smaller group of people to worry about. You might want to think about setting up a filter of friends you truly trust and using that for posts with personal information in them.
Remember, if you've never given Frienditto your username and password, then the only part of your LJ that is at risk is the public posts and any f-locked posts that are accessible by people you aren't sure you can trust. But without your username and password, there's no way they can get into your account and do any damage or anything.
If your name is not on the list, you may want to check back through your older posts and make some of the more sensitive ones filtered or even private.
Here is info on creating custom friends groups/filters.
Here is info on security settings for your posts.
I just hate to see people jump in and defriend people when they may not need to. That said, if I see any of my f-locked posts show up there... I'll just defriend everybody. Well, almost everybody. There are a few people I know I can trust. :-)