How corporate brands can deal with "synthetic authenticity" using social media
It's long been known that corporate brands have started using social media in way's it was never meant to be used. The fact that faceless entities exist on sites where personal transparency is valued, is unusual.

A couple days ago my friend was telling me about having a conversation with Nike Plus on Twitter. He didn't know who the person was that he was talking to, but assumed it was someone from Nike.

Example:

If your already trusting a person (or group of people) to be the voice of your brand; you might as well tell us. That would deal with part of it. You still need to work on the content they produce. It shouldn't feel like the company's forcing them to produce content that promotes the company; the spokespeople for your brand should create content that's valuable to your target audience.
Act more like a brand

If you're here, why pretend to be one of us when you can help us connect to each other? You can create a hub of activity with your branded page. It's possible to do it on any network. Rather than producing your own content, find people within your target audience to syndicate. Mentioning them and using their content will help connect users within your target audience. You'll get known as a great place to find people to connect with.