These include the area's arson reduction team funding text messages warning of the consequences of deliberate fires.

BBC: Facebook used to help fight grass fires in north Wales

But the Jockey Club introduced "interim amendments", which include allowing jockeys to check for messages during racing in a designated area.

BBC: SPORT | Other Sport | Horse Racing | Jockeys in walk-out

They want to learn who gets cited a lot in other people's messages or shows particular expertise in some area.

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When researchers zero in on electrical activity in yet another area, they can tell which parts of commercial messages, if any, are encoded in the experimental subjects' long-term memories.

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The most interesting area, though, is the interaction between perfumes and natural scents that carry messages but do not have the specific properties of pheromones.

ECONOMIST: Perfume science

South Central Ambulance Service NHS Trust said messages were being sent to all front-line vehicles in the area alerting them to the closure and advising them to follow diversions.

BBC: M27 closure: Motorway closure continues through weekend

Sites like mint.com can be set up to send text messages to your phone if you start spending more than your target in a particular area.

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Comptel, an American business association, has accused Telmex of not consolidating local area codes (so local calls are charged as long-distance) and of inserting recorded messages into calls from rival carriers, warning that future calls might fail.

ECONOMIST: Carlos Slim

Ship and plane captains all over the area get word of the whale location in near-real time through e-mail alerts, text messages, faxes and pager messages.

CNN: Spotting endangered whales from the skies

Messages of support for Malala will be read out by children from several schools in the Paris area who are also representing different regions of the world.

UNESCO: MEDIA SERVICES