you're stuck at a 199x model of internet social interactions, these company are posing as stand in replacement for personal interactions and as such are trying their hardest (and succeeding, even, especially in the younger population with is the subject of this discussion) in registering people with their true identities.

That makes the similarity to physical social interactions stronger, not weaker. Most people live their offline lives under their true identities.

The image you phisically project in other people head is a) ephemeral b) local c) not indexed and d) inaccessible from unrelated third parties

I can't believe I've to explain this...