Meograph is a media making tool that you can use online for free in your web browser. It allows you to create unique mixes of media content, including photos and videos you find on the web, as well as your own media assets. It has robust tools for annotating media with map data, narration, text and links. It uses a sequence-style editing format that allows you to create a flow of 'moments' from the media elements you choose to bring together. In this way it can be an extremely useful platform for online media making.
To get started, head over to meograph.com and sign up for an account, then follow along with the video below.