Is there something about P2s that prevents the number of them from multiplying out of control?

A persistent theme I see with Confluence is that data just keeps getting added into Confluence, but without any organization or structure. It effectively becomes a "write only" structure - data goes in, but doesn't come out.

This line from the post jumped out at me:

"It’s organized much like a Yammer or Facebook stream, but on the back end it still operates like a blog, allowing for archiving, advanced search, and rich media embeds."

Does advanced search help P2s retain their discoverability? Does that make it easier to find relevant P2s?