What Customers Hate About Your Brand in Social Media

Doesn't this give great insight? Direct feedback: 
42% are turned off by poor spelling, 24% by sounding too "sales-y", they also aren't impressed when you try to be funny or don't post often enough...

Takeaway:  SPELLCHECK, SPELLCHECK, SPELLCHECK! Be honest, give info but not pushing, avoid trying too hard & post consistently!