Help find missing children by retweeting appeals on International Missing Children's Day (IMCD). Missing People will be tweeting an appeal for a different missing child every 30 minutes for 24 hours on their official Twitter account.

All you have to do to show your support is retweet one, some, or all of @missingpeople's appeal tweets using the hash tag #imcd as they go out. Let's make #imcd trend!

WHAT: The Big Tweet for Missing Children – a Twitter marathon to mark IMCD.

WHEN: Wednesday, 25 May, 2011, for 24 hours beginning at 00.01 BST