Hello SonOfAMotherlessGoat, thanks for your question.
Yes, is necessary to verify in any way the participants; and as the raffle is based on these two social networks these are the bases of the same.
The news about raffle will be announced by the #SorteoWRTNode hashtag, please consult in my twitter without registering for more information; but if you want to participate, you should register.
Sorry for the inconvenience, and have a Happy New Year.
Mi blog sobre seguridad informática y Raspberry Pi: