Spending too much time on Facebook? You’re not alone. A new study from Neilsen shows that Americans have tripled the time they spend on social networks and blogs. Even has-been MySpace is getting a lift from the rising tide. On average, you spent seventeen percent of your online time on social networks and blogs in August 2009, up from six percent the year before.

When it comes to online media, advertisers are often slow to go where the audience goes — but in this case, they’re definitely catching up. Advertisers increased their spending on social networks and blogs by a whopping 119%, up to $108 million in August 2009 from $49 million the year before.

Now you won’t feel so guilty about goofing off on Facebook. Even Madison Avenue’s starting to hang out there.

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