Unless it is specifically stated not to, you can always do a Spots with a friend, as that can often be how you would normally go shopping.

But you should always answer the questions as if you were doing the Spot alone, so always finish your tasks, including the photos, by yourself. Sometimes Spots can be offered several times as they require different point of views, in which case your friend might be offered the spot and they accept on the system. Then they should report on their own views.