Venmo the Bride? Your Guide to Wedding Etiquette in the Social Media Age by Alix Langone It’s that time of year again, when your Instagram and Facebook feeds fill up with posts of happy couples sharing the news of their recent engagements. December is the most popular month to pop the question, and for many millennials, that means one thing: save that Christmas check from Grandma. Because you know what’s coming next. Weddings. Lots of them.