If you see what looks like an official FarmVille English Coutryside post (see image above) appear in your Facebook feed, don't click on it. In the forums, people have been saying this has been appearing in their feeds, and when you click on it, you are taken to a page that wants you to fill out an offer before you get to England. Some people say that, when they click on the post, it sets off their anti-virus warning system as well.
So -- as tempting as it may be (yes, we all want a sneak peek at the new English Countryside expansion in FarmVille), don't click! It's a scam.