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This logo is probably just fine how it is. I like the green and grey. I agree that the black should be more of a charcoal. The concept of the voices seems like it could be represented visually (graphically) somehow.
In it's current state, there is tension between the words "online" and "voices" because they are the same size and symmetrically spaced above and below the line. My eye gets caught up there and doesn't flow downward through the logo smoothly. Lining up the l and i could improve this.

nice