I am K

Hello,
I am K, and I come from the Internet.  I am the clicking keyboard on the other end of the wire.
Tap, tap, tap.
How loud must I type to be heard?  How much do I have to think, to think I have something to say?
Tap, tap, tap,
I'm the spam in your inbox.
Tap, tap, tap.
I'm the quip on your Facebook page.
Tap, tap, tap.
I am the reply to your craigslist personal ad.
Tap, tap, tap.