Can anything be a question as long as you put a question mark at the end?

Lately, here on Fluther and other internet sites, I’ve seen an abundance of questions that, to me, don’t really seem like questions.

They read more like command statements yet have a question mark stuck on at the end like it’s as confused to be there as I am to see it.

The examples I’m talking about are ones where there is no previous conversation and the sentences are not in response to anyone’s question or input.

Example:
Answer my question?
See inside for details?
Please Advise?

Am I wrong in thinking that these aren’t questions? Is there a grammar rule I am not aware of?

Answer my question after reading these details?