Looking to randomly select, concatenate string of text stored in variable

Problem

In my scripts.js the variable var fullURL = not getting the actual text to be tweeted out in the teaser1, teaser2 and teaser3 that I've stored in a variable. I basically want one of the three teasers to be randomly selected when people click fa-twitter

scripts.js

function shareTeam(){
    $(".fa-twitter").click(function(){

         // Grabs the names of all the players in the span
         // Sets a variable marking the indexOf each of the names
         // If the index doesn't find a space, it returns -1, which returns the full name
         // Otherwise it will return only what follows the space
         var lastNames = $("li span").map(function() {
           var name = $(this).text();
           var index = name.indexOf(" ");
           return index == -1 ? name : name.substring(index + 1);
         }).get();
         console.log(lastNames);

        var regularNames = lastNames.slice(0, 3); // Same as below, but no shuffling

        regularName1 = regularNames[0]; // Forward
        regularName2 = regularNames[1]; // Forward
        regularName3 = regularNames[2]; // Defenseman

        // Find me a random number between 1 and 3
        // Where 1 is the start number and 3 is the number of possible results
        var teaser = "teaser";
        var rand = Math.floor(Math.random() * 3) + 1;
        console.log(rand);

        // Concatenate the two strings together
        teaseRand = teaser.concat(rand);

        // These are the components that make up that fullURL
        var baseURI = "https://twitter.com/intent/tweet?url=";
        var twitterUsername = "stltoday";
        var interactiveURL = "http://graphics.########.com/STLblues";

        // Randomly generate one of three teasers
        var teaser1 = regularName3 + " to " + regularName2 + " back to " + regularName1 + " — GOAL! Create your own all-team #STLBlues team: ";
        var teaser2 = "I picked my #STLBlues dream team. See which players I've chosen and build your own: ";
        var teaser3 = "My #STLBlues team will skate circles around yours! Pick your team: ";

        // This is the full url that will be switched in and out
        // var fullURL = baseURI+interactiveURL+"&via="+twitterUsername+"&text="+teaseRand;
        var fullURL = baseURI+interactiveURL+"&via="+twitterUsername+"&text="+teaseRand;

        // It needs to be encoded properly as well
        var encodedURL = encodeURIComponent(fullURL)
        console.log(fullURL);
        console.log(encodedURL);



        // Change the href to the link every time the Twitter button is clicked
        var changeLink = $("link--twitter").attr("href", encodedURL);

        // if (lastNames.length === 6) {

        // } else {
        //     // Generic teaser
        //     var teaser4 = "Pick your #STLBlues dream team from 50 of the best @StLouisBlues to hit the ice: " + interactiveURL + " (via @stltoday)";
        // }
    });
}