Are Old Desktop PCs the New Old Mobiles?

I’ve noticed a trend towards people giving away their old desktop PC in the same way that people give away their old mobile phones. I’ve recently received two cast-offs myself, and have passed them on to better homes. One was from the back of a boot at a wedding. But what use is a PC incapable of running Windows XP in this day and age? Well, they’re good for spare parts if you’re trying to work out which bit of your PC has stopped working and is causing it to crash. Also, some Linux distributions like Xubuntu are designed to give your clapped out 1990’s PC a new lease of life. Failing that, give it to me!