Just updated with a blog post: http://blog.coinbase.com/post/47198421272/data-on-public-mer...
These are merchant checkout pages. Your information is not going to be shown on one of these pages unless you created a "buy now" button, donate button, or checkout page and posted a public link to it somewhere as a merchant. Order pages are designed to be public so customers can reach them, but we messed up by making them publicly indexable and including merchant contact info there without being more explicit. The email in particular should not have been included. More details in the blog post. Very sorry for the trouble on this!
Why can't those stay anonymous?
And was actively defended and supported the last time a thread came up questioning the issues that Coinbase was having:
https://news.ycombinator.com/item?id=5427985
Turns out those questions were justified. They've outted people selling bath salts and god knows what else.
So much for anonymity. Between this, MtGox, Instawallet, do we still believe Bitcoin is taking over the world?
You don't really believe this, do you?
On the other hand, if you actually look at what these pages are, they're Checkout pages, not Transaction pages. Coinbase sellers generated these pages and intentionally linked to them. Someone even mentions this in the fourth comment on the linked page.
Let's say, for some reason, you have some information from a site you own that you want to remove from Google search. How long does it take to remove it?
It's one thing to lose people's bitcoins or randomly delay/cancel transactions (both of which Coinbase has been accused of). People know that bitcoin is still young and the companies supporting it are inexperienced, so they expect that. But exposing personal info and purchase history goes beyond any definition of 'unacceptable' or 'incompetent'. Over in the Reddit thread, they're already linking Facebook accounts with illicit transactions.
Users from Bitcointalk told Coinbase a week ago that they were starting to get phishing emails, which means someone has been mining this data for a while now. Yet there it is, still available through a simple Google search.