This 'official' account gives the impression that no term had much common currency, apart from the jokey 'super-hardcore do-gooder' before the end of 2011. I can't comment about whether other branches of the community used terms in a similar way- I've never heard of felicifia. http://www.effective-altruism.com/the-history-of-the-term-effective-altruism/
I'm not sure that it's the corporate structure that makes negative selection more useful in the data entry case. It's not the fact that the data-entry clerk is part of a large organisation that means that a slightly incompetent data-entry clerk is more disruptive than a genius-level one is helpful. Rather it's the fact that data-entry is a relatively low skill job and with relatively little room for excelling above mere competence. Leaving the corporation wholly out of it, and imagining a person doing data entry in complete isolation, the most helpful dat...
I certainly agree that effective altruism existed long before GWWC.
The discussion I'm addressing though is about the origin of the term "effective altruist."