Invisiweb
Get flash to fully experience Pearltrees
Invisible Web: What it is, Why it exists, How to find it, and Its inherent ambiguity
What is the "Invisible Web", a.k.a. the "Deep Web"? The "visible web" is what you can find using general web search engines . It's also what you see in almost all subject directories . The "invisible web" is what you cannot find using these types of tools.