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One very apparent trend is that some authors only plug their books or related products in their tweets and never provide any other information. These authors were culled from the list in favor of those writers who are trying to carry on a conversation with their followers and present information they might find valuable, whether it directly benefits them or not. After all, why would I want to follow someone who only tries to sell me something?

Tweetizen is a simple web-based tool designed to help you filter the daily influx of tweets, and easily find the ones that are relevant to you.

Placefy is fun geographic game that teaches you about world cities in pictures, we ask you to identify cities by displaying one picture at a time and if you are correct you will earn points and jump levels. You can tweet and post your score to facebook any time.