But has he been too quick to write off the potential of Twitter as a way of tracking the spread of viruses?
Ultimately, the technology could go either way, acting as an effective method of cross-checking people across a vast security network as they move from country to country, or evolving into an omnipresent grid of surveillance that will spread viruses and confine us all to our homes lest we feel the wrath of cyber criminals or high-tech fascists.
"Since direct contact is one of the ways flu viruses spread, we have decided to forgo the traditional congratulatory handshake as you come forward to receive your diploma and have your photo taken with your dean, " the school told students in a letter posted on its Web site.
CNN: Students can't be part of main graduation because of Mexico trip
It is one of a growing number of viruses that attempted to infect machines and spread by exploiting human gullibility.
Compared with Napster, Gnutella is nowhere near as easy to use and illustrates the danger of sharing files, including viruses that can spread quickly throughout a network.
Macro viruses are easy to write, and the interoperability of e-mail software gives viruses ample opportunity to spread.
Worms and viruses will use any available channel to spread, as recipients of infected email attachments, visitors to websites loaded with malicious software and users of peer-to-peer networks can all testify.
Avian flu viruses can sometimes spread to domestic poultry and cause large-scale outbreaks of serious disease.
The other stops viruses being taken into the cells of the vaginal wall, from which they can spread to the rest of the body.
Coronaviruses are a large family of viruses ranging from the common cold to the Sars (severe acute respiratory syndrome) virus, spread through droplets of body fluids produced by sneezing and coughing.
Responding after the fact used to work fine in the past, but viruses and worms spread so fast nowadays that they often end up being fixed only after causing heaps of irritation and inconvenience.
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