Rice cakes are like puffed rice cereal baked into a small disk size.
I don’t know how popular they are, not really a lot here. Most people eat them when they’re on a diet.
I’m not on a diet but I like them. I eat them with peanut butter or I get the flavored ones. Buttered popcorn is pretty good. Tomato basil is good on the savory side and caramel is good on the sweet side.
This is a picture of some toppings people put on them.
I tried them once only and the rest went out for the birds who also rejected them, so a few days later I swept them up for the bin. Cooked pastry discs are much better for adding toppings
Marmite rice cakes are definitely delicious, I can eat them straight from the packet without a topping .
Peanut butter goes well or smashed avocado or possibly both together
I suppose so, but those have been rolled with filling before cooking. Mine are more like flat biscuits that I cover with a decent sized topping, either sweet or savoury, with a cheese mix topping being my favourite Four cheeses …MMmmmmm!!!
I’ve eaten rice cakes occasionally in the past but I don’t find them at all appetising - it would take a really nice topping to make them palatable to me.
The texture is nether soft nor crisp and they have no flavour - the ultimate in blandness.
A friend of mine who cannot eat gluten often eats rice cakes - if she is going out for the day, she will often put a couple of rice cakes in her bag, in case she ends up in a restaurant which doesn’t serve any gluten-free bread or crackers.
I think she prefers to eat gluten-free crackers but they have more of a tendency to get broken up in her bag - rice cakes are more like the texture of hardboard, so they stay glued together!
I don’t think I’ve ever tried a rice cake 
(or if I have a can’t remember)
Four cheeses …MMmmmmm!!!