Clean up Twitter by hiding tweets by matching on content and removing trends and 'promoted' tweets

hideTweets.user.js

// ==UserScript==
// @name        Twitter Cleanup
// @description Remove crap from your Twitter feed without unfollowing people
// @author      @willhamill
// @include     https://twitter.com/*
// @include     https://www.twitter.com/*
// @include     http://twitter.com/*
// @include     http://www.twitter.com/*
// ==/UserScript==

(function(){
    function hideTweetMatchingText(matchString) {        
        var elems = document.getElementsByTagName('p'), i;
        for (i in elems) {
            if((" " + elems[i].className + " ").indexOf(" " + "js-tweet-text" + " ") > -1) {
                var boringTweet = elems[i]
                if (boringTweet.innerHTML.indexOf(matchString) != -1) {
                    // hide great-grandparent div to disappear the entire tweet
                    boringTweet.parentNode.parentNode.parentNode.style.display = "none"
                }
            }
        }        
    }

    hideTweetMatchingText("http://4sq.com")
    hideTweetMatchingText("http://pinterest.com/pin")
    hideTweetMatchingText("http://instagr.am")

})();

(setTimeout(function(){
    var elems = document.getElementsByTagName('div'), i;
    for (i in elems) {
        if((elems[i].className).indexOf("trends-inner") > -1) {
            var trendsHeader = elems[i]
            trendsHeader.style.display = "none"
        }
    }

    var elems = document.getElementsByTagName('a'), i;
    for (i in elems) {
        if((elems[i].className).indexOf("js-promoted-badge") > -1) {
            var promotedLink = elems[i]    
            promotedLink.parentNode.style.display = "none"
        }
    }
    

}, 2000))();

First function removes any tweets containing a given content, e.g. links to FourSquare.
Second function removes the Trends left-side div.
Third function removes any 'promoted' tweet.