Don't know about Yammer, but Valve has a very flat structure where engineers work directly on projects that they are interested in (and presumably that they think will bring in revenue). Quote from their (definitely must-read) employee handbook:
"We’ve heard that other companies have people allocate a percentage of their time to self-directed projects. At Valve, that percentage is 100."
Biggest problem I had with my perusal of the app was the text on the lower cards is just way too small to be legible from a reading distance. Making the cards full-screen just slows down my interaction with it, requiring a swipe for every card.
Overall, it's a good interface for reading news articles and blog posts. It seemed like a terrible interface for going through status updates and wall posts.
Had the same thing happen to me with a friend (me on iOS, him on iOS->Android) - it seemed to me that the trick was to press 'Send as Text Message' when the message fails to deliver. From then, it seems to work fine, as that probably forces a check on the Apple ID validity.
I suspect that some of the negative sentiment here on Apple Maps is because of the strong entrenchment in Google Maps and its ways, before Apple was around in that game.
I actually happen to love Apple Maps, so much so that I've started to use the Mavericks app as well. It's definitely more visually nuanced and aesthetically pleasing. For where I live at (SF Bay Area), I've never experienced any major problems with routing or data - public transit is not my default use. The tight integration with Yelp adds to the comfort and familiarity as well.
> For where I live at (SF Bay Area), I've never experienced any major problems with routing or data
I think Bob's Discount Maps, Bait, and Tackle probably works fine in San Francisco. Outside the Bay Area, it's bad. Outside the US, you'd be better off with paper maps than Apple Maps -- they'll burn better when you're lost.
I think it is quite insensitive, the way that post has been written. Scattered with so many private messages and needless investigative fluff. I do think it brought to discussion an important topic, but I'm not sure I appreciate the way it did.