By encouraging guests to post to Instagram & Twitter using your hashtag, you are building your social media footprint. For every post with your hashtag, all of that user's friends will see your brand and the social media outreach is exponential.
Why not stream photos taken at an event in real time during the event itself. You can even display guests tweets during the event on a monitor, TV, or projection screen. Having a social media slideshow at your event adds another level of fun and an additional talking point for guests at your event or party.
Encourage more people to upload
Contest mode allows you to define a winning ticket template that gets printed a certain percentage of the time. You can use this to offer an incentive for people to tag their photos in order to win a prize.