Looks like the regular Internet users are having a tough time figuring out what twitter is !
One of the breakout query for twitter is ‘What is Twitter’ – with US netizens leading the query, followed by Canadian and Australians.
What this essentially means is that Twitter is penetrating the regular internet user population (which is probably used to Yahoo/eBay/Amazon/utilitarian kind of sites) and will hopefully, find a place in mainstream usage as well.
Meanwhile, this video nicely helps you understand twitter in plain English:
Also see: Twitter India User Profile