I gone through the link but is it worth using this.
How much will i be able to earn approximately.
All depends on how many retweets your content is able to get!
Well, I have a content which retweeted 4 times. And I earned 0.0004 BTC, not pretty big but it's good enough for me
Are you paying flat rate of 0.0001 btc per tweet regardless of the numbers of followers or people with large numbers of followers are being paid more?