Of course your real identity is probably involved somewhere. It's just that I, and many others like me, don't think a third party should know what my real identity is. It's not their business.
Edit: Unfortunately it probably is their business. A poor choice of words.
No, not really. I don't apply for jobs, book flights or vote with my Facebook account. I'm not concerned with what kind of insights that Facebook can infer from a fake Mickey Mouse account. I'm concerned about the possibility of being discriminated against in the real world based upon data gleamed from my online interactions.
You can get discriminated when booking flights though and you get selective propaganda through your FB account though... so you individually may not be affected but your group, whatever that is, may be.
Edit: Unfortunately it probably is their business. A poor choice of words.