Consider the communication roles in a typical social media platform. There are posters, amplifiers, and aggregators.

The Poster synthesizes the world around them. These are your bloggers, micro-bloggers, essayists, shit-posters, or anyone who forms narratives.

The Amplifier spreads the word, often sifting through our noisy feeds for signal. These are your rebloggers, quote tweeters, and video stitchers.

The Aggregator guards the zeitgeist and compiles a complete accounting of events. These are your weekly digesters, Wikipedians, and digital archivists.