Google is adding forum topics as deep links for some search results. These can occur for your traditional message boards or even answers sites.
Google says that the deep links will occur for sites that appear to have a large number of discussions on a given topic.
Check out this search for "laptop fan noise" and notice the forum deep links under the Yahoo! Answers result:
Optimising Digital Marketing Campaigns with Search, Social and Analytics
At SES London (9-11 Feb) you'll get an overview of the latest tools, tips, and tactics in Paid, Owned, Earned, Integrated Media and Business Intelligence to streamline your marketing campaigns in 2015. Register by 31 October to take advantage of Early Bird Rates.