While social media can do a lot to humanize a brand; increase the effectiveness of customer service, and create brand evangelists, it also can cause damage.
I've said this before, and I'll say it again - brand management is a matter of common sense. People want to be heard, they want a human being to say "I'm sorry that happened, let's see what we can do to make it right." They will let their friends know how they were treated - because they can.
Yet common sense is in short supply in corporations, or so it seems.
These three social media marketing mistakes are made over and over by companies that just don't want to believe that customers really are in control, and that what matters most about your brand is what comes up in Google.

1- Start a Twitter account then don't use it.
Let's use @TimeWarnerCares as an example, although many other brands are equally inept in social media.
@TimeWarnerCares opened a Twitter account, which has 563 followers - some of whom might actually be brand evangelists. @TimeWarnerCares didn't bother to follow anyone, so they have no way to know who wants to talk with them.
Who is Tweeting for the company? There's no way to know because there's no bio ...
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