Friendships come and go, but as long as you have friends who fulfill these seven roles in your life, TikTok believes you're pretty much okay. The 7 Friends Viral Theory posits that everyone should have seven friends, each of whom brings a unique perspective or offers a unique value that no one else can.

The trend lists seven specific "roles" that each friend typically takes on:

A friend you've had since you were little.

A friend who can make you laugh in any situation.

A friend with whom you can stay for a long time without talking, but nothing changes.

A friend you can tell anything to.

A friend who is like a sister.