The logline currently is a summary, but I am not sure where it is going. Help the reader to know that this is a comedy. Nothing may be at stake for the protagonist so give some hints that it will be comical/hilarious etc... Dropping a clue or two will enhance it's ability to attract your reader. Without more, at the moment I am not sure of what to expect and if I want to "watch it"

When an unknown Hollywood extra accidentally unfollows the world’s most famous actress he comically struggles to deal with becoming a worldwide phenomenon.

When an unknown Hollywood extra accidentally unfollows the world’s most famous actress on twitter, he bumbles and stumbles through the challenges of becoming a worldwide phenomenon overnight.

Thanks for the advice James.Those do sound clearer.

Sounds like a film I would love to see

I would love to see this as well!