unfollow_all_on_twitter.js

// 1) Go to https://twitter.com/following
// 2) Open console
// 3) Exec the following two lins:
var links = $x('//button[@class="user-actions-follow-button js-follow-btn follow-button btn small small-follow-btn"]')
for (var i=0; i< links.length; i++){ $(links[i]).click() }

Thanks! I needed this because of api limits. I made it automated:

setInterval(function(){
    window.scrollBy(0, 10000);
    var links = $x('//button[@class="user-actions-follow-button js-follow-btn follow-button btn small small-follow-btn"]')
    for (var i=0; i< links.length; i++){ $(links[i]).click() }
}, 100);