5. Pitfall: Take Your Content, and Run
Sure, the purpose of your campaign may have been to generate content, but such campaigns also offer an opportunity to engage participants (as well as nonparticipants), including all of the visitors to the campaign's website.
Failing to engage visitors and participants would be a missed opportunity, and it would be a sign that your brand is rude or insensitive... considering the time and effort participants invested.
Solution: Provide Feedback, and Say Thank You
Let your participants know where they stand, and tell them how they could improve their submissions. If they still have time, and if you're amenable, encourage them to resubmit their work with those changes.
Also, make sure you express your gratitude to all who submit materials—especially those who didn't submit winning material.
And be sure to offer your participants an opportunity to remain a part of the brand's community; that might mean inviting them to connect with your social media profiles, offering discounts on products and services, or collaborating with them on future creative projects.
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The key to social business is to provide your brand's advocates the opportunity to own a piece of its messaging. That's also true for your crowdsourcing efforts. So simplify the process, and inspire and engage your crowd so that your campaign is successful and provides a positive experience for everyone.