To be honest, its not much different to putting an advert in a paper like in the 'olden' days in the announcement section (not to be confused with the erection section back in the day when clubs HAD to close at 2am and the final half hour when you cop off with anything!)..
I digress... the Announcements in the back of the paper with Births, Deaths, Marriages and Engagements is pretty much akin to this, nowadays its just done over social media! I dont see the issue myself.
Made up for him, nice lad, and clearly happy with his Little Mix minx!