IS your site ranked by Google as a Tier 3, ensure to get to Tier 1 or 2?
My Google theory: Once your site hits a certain level (i.e. Alexa ranking) in ranking and relevancy, expect your site to get much higher quality traffic/targeted with more user comments and engagement. It is alone tough to get there. You have now entered in what major search engines call Tier 2 quality which is a much high quality site. Breaking through to Tier 1 is very very tough game with a lot of creativity. How do I know this? I studied a private white paper from IBM in how the things like Google architects their search business. This is a measure by how many Google bot activity you get as they sniff (aka spider) around your site. Most  lazy site webmasters have their site sit at Tier 3 which is around 97% of all out there.
NOTE I now post my TRADING ALERTS into my personal FACEBOOK ACCOUNT and TWITTER. Don't worry as I don't post stupid cat videos or what I eat!