Girls, when you respond to a text message with only a smiley face, what are you trying to say?

JSmuve
It's all in the question. Say you're texting with a guy and in your response you give a smiley face :) and nothing more. What is your reasoning and/or intention behind this? Obviously context is important, so if you can come up with more than one scenario with different rationales then feel free to list them all.

My interpretation is that either she's run out of things to say and is trying to keep the conversation alive, or that she doesn't want to keep up the conversation anymore.
Girls, when you respond to a text message with only a smiley face, what are you trying to say?
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