Rocket Lazy Load is a simple but powerful plugin with a tiny (less than 2kb) lazy load script without any jQuery and others libraries. What all this script does is, it displays images on pages only when they are visible to your user’s eyes i.e. only when show up on screen with down scroll. Hence, this trick reduces the number of HTTP requests mechanism and improves your website’s loading time.
TechCrunch uses Socialite.js script can for displaying social media sharing buttons with lazy loading feature. Lazy load simply means that the real js sharing buttons comes visible only when you hover over to them, this way you increase your page loading speed up to some extent. This tutorial is on a free WordPress plugin that enables TechCrunch like social sharing buttons in your self-hosted WordPress blog.