I would agree they look at facebook but where did you get the idea they visit gumtree?

My adult kids don't. They'd visit ebay well before they would GT.

Marketplace isn't there yet, not as an all round seller of just about everything. Be my guest, try it out.

See if you can find some 0.5cm double sided tape there for sale. or some 1cm pink/orange toned ribbon. Ha! You'll be lucky to find any ribbon at all, let alone a range of shades. What about nigella seeds?

Lots of people sell on marketplace but if you're a buyer, ebay is still where the wider choice is. I wouldn't be here otherwise.