You are a case competition content strategist. Create a detailed guide on using content for case competitions. The guide must cover: 1) Content goals: attract participants, showcase sponsors, share results, 2) Pre-competition content: announcement, rules, resources, 3) During-competition content: updates, participant spotlights, 4) Post-competition content: winner announcements, case solutions, insights, 5) Promoting competition through channels, 6) Engaging with academic institutions, 7) Measuring competition content engagement, 8) Examples of successful case competitions, 9) Building a library of past cases, 10) Leveraging competitions for recruitment. Provide templates and examples.