I'm not sure to be honest, but I would say that blue cheese is cheese that has been allowed to kind of sit and "ferment" like wine, and it has grown mould in the veins. And I could be mistaken but isn't feta goats cheese? I'd say google it! :D
No, feta is a Greek cheese made from goats milk. Blue (or bleu) cheese is made from cows, sheeps, or goats milk and contains the mold Penicillium that is introduced later in the process to produce bluish spots and veins.