This graph shows that the number of posts was highest on the day of the announcement, peaking at a rate of about 3 posts per minute. We can see that there was immediate interest in this project with the first mentions of the #dearMoon hashtag appearing on Twitter within minutes of the announcement. The #dearMoon mission branding was tailor made for social media, with the name of the project literally being a hashtag. No doubt this contributed to such quick and high volume social chatter.
The #dearMoon announcement also caused a huge spike in mention volume for the SpaceX brand. This spike multiplied that brands normal chatter volume by a factor of ten for two days before returning back to normal. SpaceX often has these big PR events, and they are always correlated with a huge spike in social media buzz, a great indicator that the PR event is having its intended effect.