I am not sure how long I will keep this instance running. It may be two months, or it may be 10 years. I can't guarantee that your toots will persist for all time on these fine servers in the cloud. I can however promise that I will give 25 days notice of shutting down. That said, if you still feel like joining, then you are welcome to join.
Read my post on how to create a Mastodon instance: https://medium.com/@uistephen/part-1-creating-your-own-mastodon-instance-getting-started-fd4cb25fe193
Mastodon is a social network based on open web protocols and free, open-source software. It is decentralized like e-mail.