I was thinking the same thing ... but I was going to steal random content from the Twitter firehose. You'll want a bit of smarts behind it so that it's not obviously you (e.g. don't post much when you'd normally be sleeping). It's relatively easy to automate a browser to do this these days (giving you a realistic user-agent and behavior). You'll also want to avoid registering key-presses at an unrealistic (or constant) rate. Apparently you can even be identified by your typing. I guess you could train it on your actual typing but that might be overkill.