Can I require participants to become fans and share to their timeline?

You can ask visitor to become a fan before participating but cannot require them to share the campaign information on their timeline.

According to Facebook's guideline for fan page marketing, a sponsor cannot mandate participants to share specific information on the Facebook wall.

Facebook fan page guidline:

How to encourage users to share your event?

Based on our experience and observation, visitors are more inclined to share events that they participated or events that give them a sense of achievement, such as poll, upload photos, check-in, comment & share, or discussion on a hot topic.

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