Well, my initial estimates were wrong. I thought I could retweet the posts and Twitter would give me accurate results. The problem is with twitter results. They are giving me wrong and irrelevant results.
Also, when I ask Twitter to only send me “positive” tweets, it sometimes does not mark most of the positive tweets as “positive”, in fact they are not marked at all. So there are the “positive” tweets, “negative” tweets, “questions” and “unknown” (or “unrated”) tweets. A quick look at these tweets and I can see many of them as good ones that should have been retweeted but they were not.
To get over this situation, I need to have an admin panel where I can see statistics and possibly “approve” the negative / unrated tweets.
Having previous experience working in Zend Framework, CakePHP and CodeIgniter, I would prefer to build it in Code Igniter. I will keep this page updated with more info.