why 'anonymizing declarations'?

The word 'interpellation' describes the act of subjectification by way of hailing. Hailing, as distinct from naming, incorporates feedback. In other words, naming something is applying a label or modifier to it. Hailing, on the other hand, involves a reciprocal transaction. You stand in the street and say, "Hey, you!" The other one first must recognize what and who you meant, then make a quick decision whether or not "You!" is her or him, and then make a response.

It's often more subtle and complicated than this. Feedback comes into play as the listener understands who/what is meant and then evaluated him/herself in those terms. The label impinges on the evaluation.

I'm in a park. From behind me says, "Excuse me, sir." Do I turn around? Who the hell is 'sir'? Oh, that's me. I become 'sir' and self-apply the label at that moment.

In the case of the craigslist ads I'm using to generate these sketches, the poster is speaking her/his "Hey, you!" to a completely anonymized listener. Part of the recognition, self-application, and response that ensues serves to anonymize both the respondent and poster. A doubly articulated anonymization based on interpellation that doesn't name, it erases a name.