[brimble]

I've not dug into it, but explanations I've read that claim they kinda did have a culture until they reverse-acquired themselves with the DoubleClick purchase have some ring of truth, just from my casual external observation over the company's lifespan. It lines up (c. 2008) with some other things—inline ads going full-evil, the search engine anti-spam efforts evidently drying up (or, at least, entirely failing from then on despite whatever effort they were making), et c.