Twitter, for example, is great for getting real-time feedback to events, but (obviously) is very concise. Conversely, provides more depth on topics, but at a slower pace. IntenseDebate and Disqus provide more concise feedback (usually, anyway, comments are shorter than the posts) but are even slower than posts to WordPress because comments by necessity follow posts. YouTube is slowest of all, usually, due to the time it takes to create videos but often provides really rich insights.