Whilst ascending the escalator at Angel station, I spied a posted for Queen musical We Will Rock You. Unfortunately I was unable to get a photograph due to being on a moving escalator, but you can take my word for it that the poster read:

 ”Join us” along with Facebook and Twitter logos. So I did join them

The page is actually well thought out, with good weighting given to people who have seen the show and want to come and wax lyrical about it, Queen lovers, and prospective customers. 

Behind the scenes videos, photos, trailers, and all the information (and links) you need to buy tickets ensure that this is a Facebook page that can deliver you through to a sale.