Unrelated, but I would advise against working for or with people that would either choke on an online alias (that is not even inflammatory :-), and/or fail to grasp at the quality of your work, reasoning and communication about the concepts therein, measuring your aptitude from that data.
...but I'll definitely hand you that signing it with your contact information likely makes it easier for those that do spot you to get in touch, for whichever reason. Which might sometimes be more interesting than vetting for ideal recruiters, especially if you want to work someplace that delegates recruiting to people outside of where the actual work happens, so the above paragraph gets half moot.
