Here is a good article from mashable.com talking about how to motivate people to share your content on social media platforms, and below is a summary of some of the suggestions from the author of the article. See the link below to read the full article.
1. Increase the offer value as people share more
Very similar to group buying, you have an incentive to share it with more people as the payout gets bigger.
2. Give Them Something Exclusive
Your give-away does not have to be something expensive, just make them feel special by offering an exclusive product/service.
3. Appeal to Their Altruism
Design campaigns that incorporates a good cause such as donating a dollar to a charity for every "share" on Facebook.
4. Let Fans Help Create the Offer
Give them what they want and your campaign will spread like a wild fire!
5. Identify, Recognize and Reward Superfans
Don't forget, 90% of content on Twitter is generated by only 10% of users. Identifying and rewarding power users will increase the effectiveness of your campaign!
Read the full article here;



