They won't poison you but the cultivars bred for their flowers mostly are not especially tasty, there are some of the specie ( wildtypes) that make interesting jam
Rowan, I've nibbled a few, nervously, and they weren't delicious.
We used to have a snowberry plant and the berries looked quite tempting, but are they OK to eat?
I suppose if fuchsias and snowberries were any good they'd be on sale.