I guess there is no magic:
- post the link (with an appropriate description) on Facebook, Twitter or Google+ today (it is only a few minutes),
- if you are running a science-oriented blog, write a post on TP.SE,
- if there is a mailing list at your faculty/institute of theoretical physics - send an e-mail.
And, of course, don't forget to talk in person about TP.SE. It is usually much more effective than just sending messages.
One more thing that may be worth consideration is preparing a pdf notice about TP.SE to print and put on cork tables at faculties.
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