What are some alternatives?
When comparing Tusk and GitHub Gist, you can also consider the following products
Evernote - Bring your life's work together in one digital workspace. Evernote is the place to collect inspirational ideas, write meaningful words, and move your important projects forward.
Pastebin.com - Pastebin.com is a website where you can store text for a certain period of time.
Sidenotes - Annotate the web.
Ghostbin - Ghostbin is an open source paste service.
Whimsical Sticky Notes - Visual project management using sticky notes
hastebin - Pad editor for source code.