This does require a bit of thought to solve, since you most likely don't want to discard the return address. A bit of crypto can solve this, but that puts quite a bit of work on the delivery service.
(On an unrelated note, what's with forcing every page to https? It doesn't hurt, but it's a bit wasteful.)
"that puts quite a bit of work on the delivery service."
This is exactly what has been done - the barcode translates to a consignment number that is useless without access to myHermes' database. This is in virtue of them having recently incorporated new barcode scanners that link them into this system.
[EDIT: dunno about the https overkill, though]
Cool.
Cool.
They've focused on the social aspect, which is great, and would be a perfect fit for reddit's current secret santa project. However, I think the applications in traditional e-commerce have more widespread potential.
For instance, I frequently purchase parts from dubious vendors on pricewatch.com, and I would love to give them a SendSocial address instead of my real address. If its easy enough, I'd use that address for everything I bought online from Amazon to eBay.
Design is very nice too BTW. I like the subtle 4chan reference in the main graphic too, fits the target audience.
Edit: Just noticed its only available in the UK. That's too bad, I hope it comes to the US soon.
Edit 2: Just noticed the nav links have no anchor text. If you're using Firefox, goto View -> Page Style -> No Style, and you'll find the page isn't very usable.
[EDIT: great idea about reddit and secret santa btw, anyone know who would be a good contact?]
To the other reply saying this isn't solving a problem but making something more convenient, I disagree. If it did make something more significantly convenient to me, it would be solving a problem. This one isn't.
"This is probably not the site you are looking for!
You attempted to reach sendsocial.com, but instead you actually reached a server identifying itself as a248.e.akamai.net. This may be caused by a misconfiguration on the server or by something more serious. An attacker on your network could be trying to get you to visit a fake (and potentially harmful) version of sendsocial.com. You should not proceed."
I can think of all sorts of uses, and the ones involving disreputable commerce (i.e. porn delivery) should provide enough revenue in the short term so that the clean ones can take root.