The world's first online seance will take place this Hallowe'en via micro-blogging site Twitter, and predictably, it's been dubbed a "tweance".

Dead celebs are the target for the session and Twitter users can nominate expired stars as well as send in questions they'd like asked.

Jayne Wallace, a "top psychic" recently used by The Sun to supposedly contact the spirit of Jade Goody, will conduct the tweance.

The contact with the deceased stars - questions asked and presumably "answers" - will be tweeted between 10am and 12pm on Friday 30 October at