An increasing proportion of motorists, including many with young driver insurance, are checking their social networking profiles while driving, according to Devon and Cornwall police.
The law enforcers have advised drivers to keep their minds on the road, and pointed out that it has been illegal to use mobile phones while behind the wheel for a "long, long time".
A recently released RAC report revealed that many student car insurance holders in south west England have admitted to looking at their Twitter and Facebook accounts while cruising local roads.
Inspector Richard Price, from the Devon and Cornwall police force, said, "With the new mobile phones, it is becoming more commonplace for people to use them to access social media than for texting while driving.
"The availability of information is sometimes too tempting to drivers and often they will be picking up the phone and updating their (Facebook) site.
"It really is unacceptable."
The police are now specifically targeting the social media users, as well as drink-drivers and people who refuse to wear seat belts.
Young driver insurance holders are reminded that the vast majority of insurers will not consider claims made by people found to have been using their mobiles prior to accidents.