Talkback Thursday : Is it ethical for bosses to keep employees under surveillance?

A company in the UK recently launched a productivity tool called WorkSmart, which allows employers to take pictures of employees at work through their webcams every 10 minutes or so. It's also able to monitor other sorts of data, like the type of apps in use, and even the number of keystrokes, which apparently, can indicate how productive you are at work. Now it's pretty common practice for employers to track some employee movements, but how far can workplace surveillance go before it's considered a breach of privacy? The question we're asking today is, "is it ethical for bosses to keep employees under surveillance?". We'd like to know your thoughts and experiences. Our lines will be open.