I quit FB more than a year ago but stared going in my profile again because I had to create a page for my app and I am shocked how slow and cluttered fb desktop site has become. its alarmingly bad, like terrible and yet I read on the news that their advertising revenue has increased. did people start using fb more? who clicks on these ads? who buys stuff on fb.
It could be a boiling the frog thing, but IMO the desktop experience hasn't changed much in a few years. It's not exactly information-dense, but more so than Twitter, somehow, despite the latter's "short text only" origins.
imho, advertising is an extremely fuzzy business. Advertisers throw money on campaigns because facebook tells them to do so, and then increases their prices. It generates revenue for sure, but i dont see it working out well in the long term