In the case of Reddit, remember that the site is built to fracture into mini-communities. Once you get involved in one or two, you meet all the people there, an

In the case of Reddit, remember that the site is built to fracture into mini-communities. Once you get involved in one or two, you meet all the people there, and remember them as they show up elsewhere. P-Dub was easy to notice because for a few months, every time he posted five people would reply to him telling him to do his homework. And karmanaut was similar, because his replies got such insane upvotes compared to other people. His legend was self-propagating. S2S2S2S2S2, on the other hand, was one of the founders of SuicideWatch. Last year I made a handful of calls to local police stations when people who threatened to kill themselves were in my area. I'm still impressed that three people were able to have such a positive and widespread influence.