A third of teenagers send more than 100 text messages a day, says the Pew Research Center.

A survey by the US research organisation revealed that SMS was more popular than face-to-face conversations, telephone calls and even social networking sites such as Facebook.

The Pew Research Centre said it was likely teens preferred text messaging as it means they can communicate with friends no matter where they are and also under the noses of parents and teachers.

It also said the surge in the number of phone plans offering unlimited texts had helped increase the popularity of texting.

The survey also highlighted that girls are more likely to text, sending on average 80 messages per day, compared to boys who send just 30 text messages each day.

Furthermore, while most teens make an effort to text their friends every day, only a third will ensure they have a face-to-face discussion as well.

"Texting is now the central hub of communication in the lives of teens today, and it has really skyrocketed in the last 18 months," said Amanda Lenhart from the Pew Research Center.

"We've kind of hit a tipping point where now teens expect other teens to respond to text messaging and to be available. There is definitely an element of text messaging that fits so seamlessly into their lives."

See also: Brits send 11 million texts an hour