Some suggestions, assuming this effect is true for other regions: - because the social functions SMM has enabled/filled/replaced are more rich and varied, so l

Some suggestions, assuming this effect is true for other regions: - because the social functions SMM has enabled/filled/replaced are more rich and varied, so longer and more differentiated conversations are more commonplace for a majority of users. Say, 'Pub social commentary' takes place online instead/in addition. - because there's a decrease in complexity of messages in web forums: as platforms like Reddit become more populated, average user interaction goes down (and more so for certain personality types), but those persons have maintained a similar amount of communication overall. - because the Internet has increased average verbal competency by increasing the raw number of written words processed. The younger you are when you start using it regularly, the more this effect is pronounced, such that only a couple of years makes a large difference. - because of a difference in the base-level of verbal fluency granted by education between the early 90s and early 2000s. Growth of the middle-class comes to mind. - because 'feminism' and 'politics': ideas that have terminology with more average letters are more popular topics. But that's a slightly silly one.