We used to stalk people via Facebook. Now, many of us get the low-down on friends, acquaintances and total strangers by flipping through artsy, retro-looking pics from photo-sharing app Instagram.

Facebook caught Insta-fever, too, this year, and plans to acquire the popular photo-sharing app. Just this week, the Federal Trade Commission gave the deal the green light, allowing the buyout to proceed.

The addictive app gives followers the opportunity to peek into someone else's world through pictures prettified using a number of light filters. Most Instagrammers opt to leave their accounts open to the public; thus, users have flocked to celebrity accounts created by teen idols and reality TV stars who don't mind broadcasting their lives (in sepia tones) to the masses.

"Who cares!?" you may say. "Who cares about Taylor Swift's cat, or about what the Kardashian family is doing!"

Ah, but some of you do care. In fact, Taylor Swift's account alone has nearly 2.5 million followers, making her follower list four times the population of Portland, Oregon, per the U.S. Census Bureau. And she's not even the most popular Instagram user.

Flip through our slideshow (below), featuring the top 15 Instagram accounts. Can you guess who's the most-followed user? Are you surprised at the accounts that made the list? Let us know in the comments section or tweet us at [@HuffPostTech]. Then check out HuffPost Tech's very favorite Instagram users, as well as our tips for things you should never do on Instagram, plus our guide to how to "normalize" Instagram's filtered photos.

Note: The actual most-followed account is Instagram's company account, which we excluded from our list. Selena Gomez was also highly ranked, but has since made her pictures private. Thus, she is also excluded from the rankings.

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  • #15 - ZooeyDeschanel

    Zooey Deschanel Actress, Singer Followers: 1,105,372 Pictures from <a href="statigr.am/" target="_hplink">Statigram</a> Statistics from <a href="http://web.stagram.com/" target="_hplink">Webstagram </a>

  • #14 - SnoopDogg

    Snoop Dogg Rapper Followers: 1,126,046 Pictures from <a href="statigr.am/" target="_hplink">Statigram</a> Statistics from <a href="http://web.stagram.com/" target="_hplink">Webstagram </a>

  • #13 - HarryStyles

    Harry Styles Singer Followers: 1,160,487 Pictures from <a href="statigr.am/" target="_hplink">Statigram</a> Statistics from <a href="http://web.stagram.com/" target="_hplink">Webstagram </a>

  • #12 - FuckYoPictures

    Chris Brown Singer, Rapper Followers: 1,179,624 Pictures from <a href="statigr.am/" target="_hplink">Statigram</a> Statistics from <a href="http://web.stagram.com/" target="_hplink">Webstagram </a>

  • #11 - Eyemediaa

    Eye Media Online business solutions company Followers: 1,182,105 Pictures from <a href="statigr.am/" target="_hplink">Statigram</a> Statistics from <a href="http://web.stagram.com/" target="_hplink">Webstagram </a>

  • #10 - RobKardashian

    Rob Kardashian Reality TV Star Followers: 1,205,312 Pictures from <a href="statigr.am/" target="_hplink">Statigram</a> Statistics from <a href="http://web.stagram.com/" target="_hplink">Webstagram </a>

  • #9 - BarackObama

    Barack Obama President of U.S.A. Followers: 1,251,611 Pictures from <a href="statigr.am/" target="_hplink">Statigram</a> Statistics from <a href="http://web.stagram.com/" target="_hplink">Webstagram </a>

  • #8 - Arianagrande

    Ariana Grande Actress, Singer Followers: 1,309,024 Pictures from <a href="statigr.am/" target="_hplink">Statigram</a> Statistics from <a href="http://web.stagram.com/" target="_hplink">Webstagram </a>

  • #7 - KourtneyKardash

    Kourtney Kardashian Reality TV Star Followers: 1,431,858 Pictures from <a href="statigr.am/" target="_hplink">Statigram</a> Statistics from <a href="http://web.stagram.com/" target="_hplink">Webstagram </a>

  • #6 - BadGalRiri

    Rihanna Singer Followers: 2,193,273 Pictures from <a href="statigr.am/" target="_hplink">Statigram</a> Statistics from <a href="http://web.stagram.com/" target="_hplink">Webstagram </a>

  • #5 - KylieeJennerr

    Kylie Jenner Reality TV Star Followers: 2,223,420 Pictures from <a href="statigr.am/" target="_hplink">Statigram</a> Statistics from <a href="http://web.stagram.com/" target="_hplink">Webstagram </a>

  • #4 - TaylorSwift

    Taylor Swift Singer Followers: 2,476,185 Pictures from <a href="statigr.am/" target="_hplink">Statigram</a> Statistics from <a href="http://web.stagram.com/" target="_hplink">Webstagram </a>

  • #3 - KendallNJenner

    Kendall Jenner Reality TV Star Followers: 2,520,887 Pictures from <a href="statigr.am/" target="_hplink">Statigram</a> Statistics from <a href="http://web.stagram.com/" target="_hplink">Webstagram </a>

  • #2 - JustinBieber

    Justin Bieber Singer Followers: 2,784,682 Pictures from <a href="statigr.am/" target="_hplink">Statigram</a> Statistics from <a href="http://web.stagram.com/" target="_hplink">Webstagram </a>

  • #1 - KimKardashian

    Kim Kardashian Reality TV Star Followers: 3,673,040 Pictures from <a href="statigr.am/" target="_hplink">Statigram</a> Statistics from <a href="http://web.stagram.com/" target="_hplink">Webstagram </a>

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