How does Zigtag differ from other social bookmarking websites?

The primary difference between Zigtag and other social bookmarking websites is that our tags have defined meanings. This makes the system very intelligent in a number of ways.

First, it solves the tag selection problem, which arises when there are multiple ways to express the same idea. Suppose you want to tag a page about New York City–what word(s) should you use? A number of options are available, such as "New York", "New York City", "NYC" or even "The Big Apple". Different people will choose different tags, and even the same person may choose different tags at a different time. In a traditional social bookmarking tool, all these tags would be unrelated and there would be no simple way to group their pages together, even though they're all describing the exact same thing. The Zigtag system understands that all these tags are describing the same idea, so it doesn't matter which you choose–they are completely equivalent. You can tag a page with NYC, defined as "the city", and retrieve it by searching for New York City, also defined similarly. No other bookmarking tool or search engine offers this capability.

Second, it solves the tag definition problem, which arises when one tag can have multiple meanings. Going back to the previous example, consider that New York is both a city and a state. In a tag-based bookmarking tool, all pages tagged with the New York tag would be placed in the same category, so you never know what the pages in that category are actually about. The Zigtag system allows the same tags to have multiple definitions, and you can choose which one to use by briefly reading their definitions. Again, this feature is unique to Zigtag.