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dan KravitzIf a piece of cardboard that depicts a baseball player is round is it considered a baseball card?
If a piece of celluloid that depicts a baseball player is shaped like a card and used to advertise a product, but not made of cardboard a baseball card?
If a piece of cardboard that depicts a baseball player has a back that can be used to send someone a message considered a baseball card?
If a photograph that depicts a baseball player with no advertising at all considered a baseball card?
If SGC slabs it it must be a card 
Why does it matter what the intent of the production of the product have to do with the idea that it is or is not a card? A card is a general term we use that is easier to define when we think of Topps and Fleer cards, but in the deadball era there was no universal production, size, material, shape, etc of "cards". Some companies used their cards to advertise their product, some companies used them to stiffen their product, and some were used to inform the public about sales, or baseball schedules, or clothing lines. The real reason they used baseball players is to grab the attention of the public and to have you buy their product. Postcards were used just as any other cards by using baseball players to sell their prodcut.
This discussion has played out before many times and not everyone is going to agree, but if you don't think PC's are cards, because they have their own designation, then you don't. In my opinion all of these fall into the category of "cards"...
Baseball card? I say in a very firm and Joey The Clown Chicago kinda way... YES!!
