Flutter was an effective, humorous parody of microblogging and Twitter. The video mocked how trivial each microblog post is by shortening the posts to a mere 26 characters. The quality of the posts was unimportant (for example, Flutter would take "keywords" from Twitter posts to shorten them to 26 characters, which resulted in jumbled, nonsensical mess); the value was placed on sheer quantity and the ability to read as many posts as quickly as possible. The concept is laughable, but also disturbing, as it calls attention to the reality of very popular Twitter. A Twitter user is simply bombarded with a massive amount of trivial tweets to the point that many tweets are ignored. The fact that users don't pay attention to all of the tweets of the people they care about shows the insignificance of each individual tweet. Compare this to other media of communication: can you imagine flat out ignoring a letter from a friend?
The problem is that the shortening of posts to only 140 (or even 26) characters is inefficient. The ability to make posts so quickly and easily only frees more time such that more posts can be made, which results in several equally meaningless posts in the same amount of time that a personal and informative email could have been written. The focus of Twitter is not to communicate significant or valuable information to the people who follow a user, but rather to offer short blurbs that are entertaining. And such is the goal of Twitter (and Flutter): not to intimately exchange information or connect people to one's personal life (as email, letters, etc. do), but rather to provide entertainment to followers.