I don't think tipping is very common in Sweden. I live in Norway, just next door, and it would never occur to me to tip a courier. It's unusual to tip in restaurants here too.
Wikipedia has good information about tipping customs and laws in countries throughout the world. Here's the Swedish entry [1].
As a rule of thumb: apart from the English-speaking countries in EU, tipping is not mandatory.
It's not mandatory in the UK either. It's certainly pretty common in restaurants, as long as they don't already add a service charge, but it's unusual to tip in just about any other situation.
No, we don't tip couriers in Sweden. Tipping is almost done at restaurants and very few other places/situations.
Wouldnt that just push the "guilt" to the consumer?