The internet might be a valuable tool to most offices, but it’s also an incredibly efficient way to goof off. Whether it’s social media, streaming video or a random collection of funny cat pictures, there are hundreds, if not thousands, of places for you or your employees to wander online, often at the expense of work that needs to be done.

According to the U.S. Chamber of Commerce Foundation, people typically spend one hour of their workday on social media. Millennials are even more attached, spending 1.8 hours on such sites. And a new survey from intelliAd Media, which studied traffic to shopping sites, found that traffic surged during weekday afternoons between 2 p.m. and 6 p.m.

Read more at CNBC.com: For a workplace productivity boost, ban these 10 websites