http://www.mycokerewards.com/content/diet-coke/share-a-taste.html
Posting a Submission on Social Media: During the Promotion Period, take a picture of yourself enjoying something you love along with your Diet Coke. Tweet the Photo on Twitter or post the Photo on Instagram, in each case, using the hashtags #ShareATaste and #Sweepstakes.
Prize
A trip package for four (4) people to Tampa, FL for THE 1989 WORLD TOURSM concert on October 31, 2015 at Raymond James Stadium (the “Concert”), consisting of roundtrip, coach-class air transportation for four (4) people from a major airport near winner’s home (determined by Sponsor in its sole discretion); two (2) nights’ accommodations at Sponsor’s choice of hotel (single room, quad occupancy); ground transportation to and from hotel and airport, and to and from hotel and concert venue in destination city; four (4) tickets to the Concert (seat locations to be determined by Sponsor in its sole discretion); a $500 check; and travel agent services. Winner must be available to travel on the dates specified by Sponsor, October 30, 2015 – November 1, 2015, or forfeit the prize.