Tiki-Toki is an excellent website for getting your students to create interactive timelines. I have used this for a few years now and have found it to be to very helpful in engaging my visual learners.
To sign up you need an email (my class use their google emails and a separate password). The free account only gives you the ability to make one timeline. It won't allow you to embed your timeline, but you can share it via a link to your e-portfolio etc. With a paid teacher account, timelines can be embedded in a class or teacher website. Along with the teacher account, students can create accounts using a class code and can collaborate on timelines.
What I really like about tiki-toki is that students are able to embed text, images and videos into their timelines giving them a very professional look and feel.
To create a timeline, students needs to first choose the start and end dates for their timeline. They then need to select a background image (copying / pasting link to image). From there, students can enter specific dates, add text and other media such as youtube videos.
Tiki-toki is an excellent resource, intuitive and fun to use and guaranteed to get your students excited about sharing their learning via this medium.
Click the link to see Paige's biographical timeline on Stan Lee.