Bubbl.us is a great service. It allows you to create mind maps within your web browser. You can share them with other people, and collaborate on them too. A great way of mapping out projects with people who aren’t geographically close.
I’ve created a quick map to show how it can work. It’s about social media, but is only for demonstration purposes: I know it isn’t comprehensive or probably even accurate. Here’s a link to the exported .png image file:
Which is very nice. But I can also embed it into a blog post, or any other site:
Which you can whizz around with your mouse and zoom in and stuff. Nice!