Is the implementation of a 'like' system beneficial of detrimental?

[Megiddo]

But that's the point. The argument should be based entirely on the words of each side. Seeing how many people "like" one side of an argument over the other diminishes the worth of the content of the argument. Popularity does not equal truth. That is a very commonly used logical fallacy. Like buttons will make such fallacies even more common.