The Firefox extension is a ghost...it's invisible...unless you first go to the Zoho Notebook page and sign in. Then, suddenly, you have right-click options - which disappear if you sign out! Also, people have been losing their data!
The semantic web must "explain the meaning of words" to computers. Some semantic technologies use a "bottom up" by embedding semantic annotations (metadata) into web content. "Top down" technologies analyze information without metadata using some form of