Publr.com is a free blogging service with a few innovative features. It allows posts of various types, including your typical text, but also including maps, videos, chat transcripts, and links. Its site has a pretty good typical web interface for such things, and there are both first-party and third-party applications to use to post. Those third-party applications use the Publr API.
The vast majority of analytics software is going to be consumed within another application, rather than exist as a stand-alone application. Recognizing this fact, analytics application vendors are racing to deliver robust sets of APIs around their applications that make it easier for developers to embed those capabilities within their applications.