Social Media Wrap: Last week for Shake Shack LTOs; Greggs unveils summer menu; Krispy Kreme half price near closing

Find out what QSRs have been up to on social media this week.  

Last call for Shake Shack's Chicken Pesto Parm, Pesto Parm Fries, Pistachio Shake, and Apricot Mint Lemonade 

Greggs reveals its summer menu.

Krispy Kreme offers half-price dozens during the last hour of trading from 19 to 25 May.