I really want to use this service and check out the interesting data it generates. But I don't really want to give away all my data to WolframAlpha. It says 'Y

I really want to use this service and check out the interesting data it generates. But I don't really want to give away all my data to WolframAlpha. It says 'Your information is only stored for one hour, so each time you return, we'll run fresh analytics on your Facebook data.' but I am not really sure. It's encouraging me to come back and let it continuously mine it? I am conflicted.