I think Twitter is where it’s at! If you enjoy writing, use Twitter as a tool for expressing yourself in fun 140-character messages. Twitter is also a great way to engage with a larger audience and get feedback about your writing. If people are retweeting your posts, you can trust that the content is good. Follow other writers and people whose work you respect, interact with them, and get in the mix. You can learn a lot from Twitter if you want to!
In addition, having a strong Twitter following will greatly benefit your book launch, since you have a built-in network of supporters who can help spread the word fast.