On Snapchat, the people who you message most frequently are automatically added to your list of Best Friends. By default, Snapchat sets your Best Friends count to three, but you can change this with a simple tweak of your settings.
Open Snapchat > the Settings menu (represented by a gear icon):
Scroll to the Additional Services section, and tap Manage > # of Best Friends:
You can now choose how many Best Friends you would like to be displayed:
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