US President Barack Obama gestures while using a computer during his first Twitter Town Hall in the East Room of the White House, in Washington DC, USA, 06 July 2011. EPA/MICHAEL REYNOLDS
Is the government watching your every move online? After reports alleged the existence of a US domestic surveillance programme, many are reevaluating their expectations for online privacy and just how much personal data is needed to protect the country. So does internet privacy still exist, and is there anything that can be done to protect it? Join the conversation at 1930 GMT.