You've created some expectation, there's only two ways that you could handle it. Either you really come up with something awesome which will make you look like you are trying to impress too hard. Or you make fun of yourself with a self-reference message and get an effect far better than you would have gotten with showing off.
Try to remember the words you said to her when you told her that you will post the funniest, smartest Facebook message ever. For example, if I told her pretty much with the words "Alright, check this out... Tomorrow... I am going to post up THE best Facebook status message you have read IN YOUR ENTIRE life. You'll love it." (where the capitalized parts show increased emotional tonality while talking), then I would put up a status like "Hello. I am the THE best Facebook status message you have read IN YOUR ENTIRE life. Be nice to me." If you can get lots of the wording from before together, the impact will be awesome. The self-reference humor is great and you don't have to come up with anything. xD In fact coming up with this is already hilarious. xD
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