I just had an odd thought. By writing "Happy XMas" here I am partly "sending/pushing" XMas greetings but also relying on readers who use RSS to "receive/pull" their own XMas greeting.
Sender -> intermediation -> receiver. Point-to-point meets publish/subscribe. The words "send" and "receive" blurr into theory-only black and white absolutes, hidden behind a thickening fog of shades of grey.
Anyway, Happy XMas.