Nothing is going to blow up or crash, if one is infected they will just not be able to access the internet.
In a nutshell here's what's happened over the last year or so. Malware downloaded and installed which changes DNS server settings on computers to direct to bad guys DNS servers for various nefarious purposes. Fix comes out for malware. Some are still infected, and even after the malware is gone the DNS entries are still changed. FBI knows the bad IP addresses for the bad DNS servers. As a safety net the FBI then directs those IP addresses to good DNS servers so the bad guys don't have control of network anymore. They put a time limit on how long they would keep the good DNS servers active, that is Monday. When they become inactive if ones DNS entries are still from the bad servers when they want to go on the net their requests will be directed to nowhere, so they will go nowhere.
Here's how to tell if your DNS numbers have been changed to the bad ones. It's a pdf, the first part explains what I said above, the last pages are how to tell if you've got it or had it and your DNS entries are bad.
It is Mac and PC BTW. Macs got hoodwinked by for example clicking on a rogue video link and it asks to install a plug in for QuickTime, and you say yes. Not necessarily porn sites either.
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