Also there is no MLS, there are a lot of them.
1. Try and get an offer before that window is up.
or
2. Put the listing up with enough wrong information that you get 2-3 more days to try and sell the property.
Apart from that, there's a lot of minor lying when it comes to these listings. Maybe the lot was 2 acres before it was subdivided, so you say on the listing that it's 2 acres. Maybe you jiggle the handle on the listing for the first week or so so it shows up as new/updated every day. Maybe you say that the listing has "central window unit AC" to try and confuse people into showing up.
It's mostly a lot of light treason against buyers and sellers. Real estate is a bit of a dogfight and much of it falls into the "technically illegal but not worth suing" bucket.
It's a complete shit show as of 2013. Basically anything that is on any MLS I've seen is probably incorrect.