I believe they might be real. Although I don't think everyone is a ghost, some people who may have unfinished business may stay behind. One's opinion on this matter differs, though, usually according to their religion. Some people, such as the Hindu, believe in reincarnation rather than ghosts. The Shinto believe everything has a soul, even rocks and other inanimate things. I think the Buddhists believe that suffering leads to happiness, and by living simply and generously one may achieve Nirvana, the ultimate state of peace and happiness.
We Christians, on the other hand...don't believe in any of that. I s'pose I'm just really open to all those things regardless, though...
~Tobi~