While the fabulously rich conversational thread features of Atlassian Answers applied to JIRA would be awesome, my team would be satisfied with just having the ability to "like," "+1," or "me too" comments on a JIRA issue. The value in this is that it enables users to voice solidarity without requiring comments that do not provide additional value. This focuses the conversation thread on high-value commentary and reduces the noise of low-value notifications (I agree, thank-you, me too, woo-hoo!) in your inbox.