Although horizontal logos still work in a number of marketing scenarios, they're a bit of a nightmare in two areas: responsive-design websites and social media.
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Utilizing 135 employee advocates, each of which has a fairly average reach (338 Facebook friends), will yield more impressions than a branded Facebook page with a MILLION fans. Whoa. It's time to think differently about employees.
If your brand is sophisticated and formal, let that be your voice. If your brand is young and hip, that's your voice. If it's gentle and caring, make that your voice.