First, Enrique Iglesias asked fans to Tweet their seat number before his #EnriqueJLotour, for the chance to meet him backstage afterwards.
Guys don't forget to tweet your seat tonight when get to Staples. twitter.com/enrique305/sta…
— Enrique Iglesias (@enrique305) August 18, 2012
The message also appeared on the electronic signs at the venue.
Lots of fans did, many including pictures of themselves, which presumably helped their chances:
@enrique305 #enriquejlotour floor 5 row 4 seat 1&2 we love you enrique!lockerz.com/s/235711816
— Blanca Zaragoza (@blancazaragoza) August 18, 2012
Fans got to meet him, tweeted their pictures, and Enrique even tweeted pics of himself and the fans:
Thank you LA and Vegas you guys were amazing! Check out some of the posters from the shows. twitter.com/enrique305/sta…
— Enrique Iglesias (@enrique305) August 20, 2012
Full details and more pics on this Storify
Very smart stuff!
Second, One Direction, who use Twitter in an incredibly engaging way, always ask fans to submit questions to them, which they answer during a section of the gig.
It goes a bit like this:
Whatever you think of One Direction's music, you have to say that it looks like a fun night out!