Most Popular Website by Usage Time

The most popular website by uniques is commonly available. But how about usage time? Facebook clearly gets the edge being the social network that it is. A research by Wakoopa shows the following results

Facebook usage accounts for 17.9% of all time spent online
Gmail is the second most popular website with 10.5% of usage time
Twitter, though used by 25% of the people studied only accounts for 4.32% of the usage time.

Gmail at second spot is a surprise. Probably people spend a lot of time clearing spam.