I know it's unseemly to toot one's own horn, but after the release I did a Topsy to see how we were faring.
I did some deeper analysis of the tweets and determined that about a quarter of the Nashorn tweets were about zoos and tanks. The exceptions were when Nashorn crossed above JDK8/Java8. The first peak was when people started tweeting about the Nashorn release video. The second was when Benjamin Winterberg announced his tutorial (40.7K hits to date.)