“blog to be knowable” … means that you blog so that when people are looking for you, or something you might provide, and they come to your webpage, they can understand who you are, what you do, so they can evaluate what value you might bring.

1. someone who uses social media (blogs/twitter) to constantly promote themselves/their products … using social media for their own gain without providing any value back to their readers/community.

2. someone who claims to be a “social media guru” etc…and claims s/he can: get you more twitter followers, improve your seo, tell you how to make money selling ebooks. etc.