Since Facebook feels the need to capture stuff I do not choose to post, I'm going to have some fun with it! I don't have the time to type stuff into textareas all day, but this JavaScript snippet does. Go to your Facebook news feed, open up your browser's dev tools, paste this into console, and press enter.

suckIt.js

var mySpecialMessage = "Suck It!";

var sendMySpecialMessage = function () {
    
    var textareasOnPage = document.getElementsByTagName("textarea");
    
    for (var i = 0; i < textareasOnPage.length; ++i) {
        
        var item = textareasOnPage[i];
        
        if (i % 2 == 0) {
            item.value = mySpecialMessage;
        } else {
            // every odd cycle through loop, blank out the message
            item.value = "";
        }
    }

    console.log("Sending message: " + mySpecialMessage);

};

window.setInterval(function () { sendMySpecialMessage() }, 1000);