] When they plotted the links and topics shared by various
] sites, they discovered that topics would often appear on
] a few relatively unknown blogs days before they appeared
] on more popular sites.
]
] "What we're finding is that the important people on the
] Web are not necessarily the people with the most explicit
] links (back to their sites), but the people who cause
] epidemics in blog networks," said researcher Eytan Adar.
]
] These infectious people can be hard to find because they
] do not always receive attribution for being the first to
] point to an interesting idea or news item.

HP tracking the spread of memes through the blogosphere