Recently my friends and family have had issues with anonymous trolls in their livejournal comments. It is a fairly well known fact that trolls are cowardly little sociopaths who spend most of their pathetic and meaningless lives hiding in the shadows of anonymity. Most of them are terrified of the prospect of being discovered. A good way to begin the hunt for such a person is to know their IP address. They certainly don't want to publicize this piece of data to the people they are harassing. As a public service I offer the livejournal logging IP addresses HOWTO.

1. Click on "Manage". I know a whole menu appears under it when you hover your mouse over it, but you need to click the word "Manage".
2. Click on "Comment Settings".
3. Grab that drop down box and select "Everyone".
4. Save your changes.
5. Optional: In this menu you can also choose to screen comments. This means that you get to read comments before they appear in your LJ and decide if they are OK. This is likely to annoy people a bit because it slows down communication when people have to wait on you to OK things.
6. Optional: You can also change your journal such that ONLY your friends can comment, or no one can comment. This is a bit heavy handed, but if you do it for a week or two most trolls will become bored and leave.

Of course if you use one or both of the optional steps you will need to save your changes again. Happy troll hunting everyone!