Idiom:

Rain on your parade ( something disappointing )

Hit the book:
Chances are
Destination
Snap
Boarding pass
Social media
Brag about
Post
Cyber
Nefarious
Bar code

Chances are, you've already done it. You're at the airport, checked in and excited to be going on your plane journey to a new destination. So you snap a photo of your boarding pass, with your flight number and destination listed, and share it with your friends and followers on social media.