def run(self, line):
        """
        Extract words from tweet

        1. Remove non-ascii characters
        2. Split line into individual words
        3. Clean up puncuation characters
        
        """
        words = []
        for word in self.clean_unicode(line.lower()).split():
            if word.startswith('http'):
                continue
            cleaned = self.clean_punctuation(word)
            if len(cleaned) > 1 and cleaned not in self.stopwords:
                words.append(cleaned)
        return words