My team launched a new product a couple weeks ago. It's an endorphin rush: jumping off a cliff, entering the unknown, showing the world what you've been doing. The longer it's taken, the scarier it is. But it feels great.
You experience the same thing to a lesser degree after hitting publish on a blog post. Tweets are a shortcut to this feeling, minimal effort for a small reward of satisfaction. That's probably why people like the tweets (and why tweeting is lazy).
Using continuous deployment for our project is like a mini launch multiple times a day. It's weird to have the steady state be constant change. But it keeps it interesting. More importantly, it's preventing burnout.