"The map shows activity almost everywhere people live; Africa may not yet be very well-wired, but it's certainly wired enough to be useful to the spammers," he said.
“结果显示垃圾邮件几乎活跃在人类生活的各个角落，或许非洲的网络还不够普遍，但是对于垃圾邮件发送者这显然已经做够了。” Paul Ducklin说。
2
I found a reference on a forum (see Resources) to someone who supposedly wired up a serial port, so that might be possible as well.