var uri = document.location.href;

function facebook() {
    var url = "http://www.facebook.com/sharer.php?u=" + uri;
    var title = "Facebook";
    var params = "menubar=no,width=600,height=360,toolbar=no";
    window.open(url, title, params);
}

function twitter() {
    var url = "http://twitter.com/share?url=" + uri;
    var title = "Twitter";
    var params = "menubar=no,width=600,height=360,toolbar=no";
    window.open(url, title, params);
}

function linkedin() {
    var url = "http://www.linkedin.com/shareArticle?url=" + uri;
    var title = "LinkedIn";
    var params = "menubar=no,width=600,height=360,toolbar=no";
    window.open(url, title, params);
}