@aral have you seen this, a similar concept to your Cannes hackathon project : http://www.panasonic.co.uk/html/en_GB/Products/VIERA+TV/VIERA+Overview/Smart+VIERA+%7C+Smart+TV+from+Panasonic/Smart+VIERA+-+Swipe+and+Share+2.0/12458841/index.html …
You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more