What are some alternatives?
When comparing Timeline and Twile, you can also consider the following products
Aeon Timeline - "The timeline tool for creative thinking. Capture, create and explore ideas."
Sutori - Sutori is the easiest way to create an interactive story collaboratively.
Newslines - Newslines lets people create shared timelines on any person, product or news event.
liniaa - See all your precious memories at a glance.
Timeline JS - Beautifully crafted timelines based on Google Spreadsheets that are easy, and intuitive to use.
Timeglider - Web-based timeline software for creating and sharing history, project planning and more...