Each address is a string of 32 binary digits, or bits, which allows for 4, 294, 967, 296 combinations.

ECONOMIST: REPORT: DATA NETWORKS: Upgrading the Internet | The

Most browsers note when a site is using security with an image that looks like a padlock, or with the string "https" preceding the Web address.

CNN: Why Google's data collection snafu could be good for Gmail

This address is your account name added to a forgettable string of letters and numbers, but it can be added to your email contacts.

WSJ: Fresh Design Brightens Evernote 5

Bono is the latest in a string of high-profile speakers from around the world to address the annual gathering in recent years, following on from Nelson Mandela, Bill Clinton and Afghanistan president Hamid Karzai.

BBC: NEWS | UK | Politics | 'Get real' on Africa, urges Bono