You can keep notes on whatever you want, private or public.
The main cool feature is the notes are fully programmatic.
Three primary components of Thinking Bicycle are links, keywords, and tags.
Links are a URL, the unique path to something on the web. For example, the URL of this particular webpage is http://ThinkingBicycle.com/help and this is how we uniquely identify pages. You can add new links to the site with the Add a Link button in the left menu. But, copy/pasting URLs by hand is a bit irritating, so most of the time you will want to use our bookmarklet. Just drag and drop this onto your bookmark bar in your web browser, Thinking Bicycle +, and you will be able to click it like a button while you are surfing the web, to add the link automatically.
Keywords are short strings, typically less than a sentence. We use keywords to describe links. For example, you might use the keyword string cute cat photos to describe a page you want to share with someone.
Tags are how links and keywords get hooked up. Once you have added a link or found an existing link, you are presented with any existing keyword tags, and you are capable of adding new ones. Tags are the main feature of the site.
There are hierarchical forums attached to every link. These forums are not controlled by the site linked to, so you can have open and honest discussions about the product, company, politician, or whatever the site is hosted by or about.
You can bookmark any tag you find in Thinking Bicycle. If you want to bookmark a page while you are browsing, just click the bookmarklet from above that you added to your browser bar, which will take you to this site and automatically add the link for you. Then just add a tag to the link, or use an existing tag if one exists and is descriptive enough for you. Locate the star button and click on it. The star will become filled in, which means you have bookmarked that link with that keyword. You can then click on the bookmarks button in the left menu to find it later.
All of your bookmarks and notes can be organized into folders, much like the folders on your computer. These folders can be nested within each other, and each folder has individual privacy controls. Your bookmarks are stored in these folders, allowing you to organize them by subject, or by whatever structure you like.
You can vote tags up or down, and please do. Those votes let Thinking Bicycle know how accurate a link/keyword tag pairing is, and a lot of good votes enables a democratic search engine, the first of it's kind. Thinking Bicycle doesn't crawl the web like all other search engines: if a user doesn't bother to add a link, as far as it is concerned that link is worthless. So if you search and don't find, click one of the alternate search buttons at the top to use an older-style search engine, like Google or Bing, and then please add the link you find, once you find a good one. That way, the next person can find it the easy way, through Thinking Bicycle (and that next person might be you: I'm amazed how often I search for the exact same thing a month or two later.)
Users are people. You can interact with other people on Thinking Bicycle, sharing links with them, talking with them in forums, following them and their shared links, being their friends, and all of the other sorts of things you would expect from a social website.