I thought it was industry norm to link a press release to the blog post. In that case, the blog post would go out first. What's the reason you decided to send out release first? I'm genuinely curious about the reasoning.
This is actually a very interesting conversation. It is interesting to see that the post on the AWS blog, hosted on TypePad, is seen as more official than the press release.
tl;dr PR newswire (BUS) comes first @ 8:54, it hit Bloomberg News wire four seconds after release. Amazon blog wasn't until 9:17, followed by others such as TechCrunch @ 10:11.
Also i doubt that typepad would be as trusted if your blog wasn't as popular. If it were some company whose blog i've never read before, i wouldn't be inclined to trust announcements from typepad. but everybody here knows the aws blog.