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Ladies dominated the day, as all five of the accounts are run by women - mostly pop stars. The fans of these stars also skew young, with 85 percent of each of the top five's fanbases averaging under 34 years old, according to Reuters. They are also international brands, with 75 percent of their followers coming from outside of the US.
Taylor Swift (who you probably already knew was in the countdown), actually has her second-biggest Instagram follow in Indonesia, Reuters reports.
But without further ado, here are the big five: