LJ-spoiler or LJ-cut - which do you prefer: an extremely important poll
[LJ-cut]An lj-cut allows you to hide all or part of your entry behind a link. The part you lj-cut is hidden on your main journal page and on Friends pages, but you can still see the full entry on the "Read Comments" page, when you preview your entry, or when you view your entry by following the link on the post.
[LJ-spoiler]You can add spoilers to an entry through use of the lj-spoiler tag. Though similar to an lj-cut, an lj-spoiler does not require a new page to load when clicked. Clicking the link will expand the hidden text inline. Plus, it works on both entries and comments.