A userscript that adds arrows on linked posts in the sidebar to show whether they are being linked to or from

linkedPostsIndicator.user.js

// ==UserScript==
// @name         Mark linked posts as whether they are linked to or linked from
// @namespace    http://stackexchange.com/users/4337810/
// @version      1.0
// @description  A userscript that adds arrows on linked posts in the sidebar to show whether they are being linked to or from
// @author       ᔕᖺᘎᕊ (http://stackexchange.com/users/4337810/)
// @match        *://*.stackoverflow.com/*
// @match        *://*.stackexchange.com/*
// @match        *://*.superuser.com/*
// @match        *://*.serverfault.com/*
// @match        *://*.askubuntu.com/*
// @match        *://*.stackapps.com/*
// @match        *://*.mathoverflow.net/*
// @grant        none
// ==/UserScript==

setTimeout(function() {
    $('.linked .spacer a.question-hyperlink').each(function() {
        var id = $(this).attr('href').split('/')[4].split('?')[0];
        if($('a[href*="' + id + '"]').not('.spacer a').length) {
            $(this).append('<span title="Current question links to this question" style="color:black;font-size:15px;margin-left:5px;">&nearr;</span>');
        } else {
            $(this).append('<span title="Current question is linked from this question" style="color:black;font-size:15px;margin-left:5px;">&swarr;</span>');
        }
    });
}, 2000);