It really depends on your specific interests and community. Total size is perhaps 1&#x2F;3 - 1&#x2F;4 FB, but there are zones of excellence.<p>If you want to find everyone, go to Facebook.<p>If you want discussion, Reddit.<p>Topics in depth, blogs.<p>High S&#x2F;N: Metafilter.<p>This might be of interest: <a href="https:&#x2F;&#x2F;www.reddit.com&#x2F;r&#x2F;dredmorbius&#x2F;comments&#x2F;3hp41w&#x2F;tracking_the_conversation_fp_global_100_thinkers&#x2F;" rel="nofollow">https:&#x2F;&#x2F;www.reddit.com&#x2F;r&#x2F;dredmorbius&#x2F;comments&#x2F;3hp41w&#x2F;trackin...</a>