Ho symbol - language spoken in India by around one million people
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Social media 'to save languages'

Facebook, YouTube and even texting will be the salvation of many of the world's endangered languages, scientists believe.

Of the 7,000 or so languages spoken on Earth today, about half are expected to be extinct by the century's end.

Globalisation is usually blamed, but some elements of the "modern world", especially digital technology, are pushing back against the tide.

K David Harrison is an associate professor of linguistics at Swarthmore College and a National Geographic Fellow.