ῥήτωρ (rhḗtōr), means "public speaker" in Ancient Greek. It's where the term "rhetorical question" comes from: A question that doesn't need an answer, or one that the answer is given by the speaker.

- Is this really a problem? No, and I'll tell you why.
- Isn't this weather beautiful?

However, sometimes a rhetorical question is a statement disguised as a question. We are so familiar with the form, that "After listening all this, how is it possible to say that the man is not guilty?" implies that the answer is obvious -even if it's not.

In text-based social media where context is limited, and the communication bandwidth is even more limited, it is often hard to decide if a question is an actual question or a statement discussed as a rhetorical question. 

Please don't use questions when you want to make a statement, it's not cute and it often leads to misunderstandings.