As content marketing picked up speed throughout 2013, top brands of all sizes took the plunge by increasing their budgets in this area. This year, an estimated $118 billion was spent on content across multiple platforms, including video and social media.

Why has content seen such success? Because 90% of consumers find custom content useful, and therefore both B2C and B2B marketers are increasingly putting focus on providing content that is entertaining, informative, and relevant. We've scoured the web to find the year's top guides to content marketing to discuss best practices for blogs, newsletters, case studies, videos, white papers, infographics, and more. Here are the top 5.

1. Content Marketing Playbook 2013 - 24 Epic Ideas for Connecting With Your Customers

2. A Guide to Marketing Genius: Content Marketing" infographic

3. Social Media Predictions for 2013

4. 10 Essential Posts From LinkedIn Marketing Influencers

5. Creating Content That Sells