parasocial relationship

A one-way friendship that many people feel they have with celebrities via social media. Because someone engages with a celebrity's social media posts and gets regular updates, they begin to feel as though they know a public figure, despite this not actually being the case IRL. 

If you or someone you know experiences an emotional relationship with a famous personality you follow on social media, you are in a "parasocial relationship" and likely need to seek help for internet addiction.