Tax assessors in Ireland used information gleaned off Facebook to audit taxpayers.
Schools in the US have been caught spying on students in their homes via webcam.
In some countries, security agencies use the web to monitor the activities of political dissidents.
So-called cloud computing, like Google Docs, provides new opportunities for personal data to become public.
With corporations, criminals and governments all looking to capture your information via the internet, how safe are you once you logon?
On Tuesday's Riz Khan show, we ask: Who is watching you online?
Joining the programme are Tim Sparapani, the public policy director for Facebook, Ginger McCall, a legal counsel for the Electronic Privacy Information Center, and Alex Deane, the director of Big Brother Watch, UK.
This episode of the Riz Khan show aired on Tuesday, March 16, 2010.