A disclaimer that reads something like this sits in many user bios on social sites: "These words are my own."
What this generally means is that although the user has identified him/herself as an employee of a particular corporation, they are participating in social media whether or not the activity is officially sanctioned by their employer.
The problem is, it's a CYA statement that really doesn't matter. If a person uses their corporate affiliation to build credibility, further association of published content with brand is impossible to ignore.
Here, try this. Don't think about a giraffe. In fact, here's one that's trying to hide, which might help you avoid the thought:
Now think about an animal. Any animal. Giraffe?
An employee doesn't need to be discussing internal operations or other official business to create external impressions of the brand. Once the connection has been established, it persists.
So why do people publish these disclaimers? Because like email footer disclaimers, people see other people using them. Now think about an animal. Any animal. Lemming?
Successful social business isn't the hokey-pokey. Companies and their people can't have one foot in, one foot out. Policy and training enable employees to participate in online conversations with authenticity – not depending on flimsy disclaimers and using their own words.