Below are some proposed social media messages. Please tweak as needed.
Twitter (@wikimedia/@wikipedia):
• WikiTowns use barcodes to share local information on smartphones, thanks to @WikimediaAustralia (link)
Facebook/Google+:
• Visitors to the small town of Toodyay in Western Australia can learn about historic landmarks by scanning QR codes that bring up related Wikipedia pages on their smartphones. Find out how this project came about thanks to @WikimediaAustralia -- and how you could bring it to your own town. (link)