Social Media Wrap: Shake Shacks holiday milkshake; Greggs' menu fave returns; Pret a Manger customers jumps the queue for Christmas sandwiches
Find out what QSRs have been up to on social media this week.
Shake Shack releases new holiday milkshake inspired by Trolls movie.
Greggs confirms Festive Bake return.
Pret a Manger gives loyalty members advance glimpse of Christmas sandwiches.