Deleting cookies/facebook.?

kay so my facebook iis saying that it has site maintenance and wont let me log on. its been doing that for about two days now.
should i delete my cookies?
annd if i delete my cookies will it delete all of my friends and pictures off of facebook?
Update: also. it sometimes does log me in but when it does it says welcome to facebook, so it pretty much starts me over. what do i do?
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