var ua = window.navigator.userAgent.toLowerCase();

        var exclusions = {

            //isFF24      : /firefox\/24/.test(ua),

            //isFF25      : /firefox\/25/.test(ua),

            //isChrome30  : /chrome\/30/.test(ua),

            isIE11      : /rv:11/.test(ua)

            //isWin8_1    : /windows nt 6.3/.test(ua)

        }

        var excluded;

        for (var key in exclusions) {

          if (exclusions.hasOwnProperty(key) && exclusions[key] === true) {

            mblog(key + " -> " + exclusions[key]);

            excluded = true;

          }

        }

        if(excluded && socialVars.adVerification){

            mb_util.fireCallBack(socialVars.adVerification, 0);

            mblog("Browser excluded");

        }else{

            limitCalls();

        }