Lazy Loading is extremely helpful if you want to keep bandwidth down. It only loads an item when it's really needed. In case of thehun that means it only loads thumbnails moments before they appear on your screen...
endless scrolling means you're adding content as you scroll down. Many sites these days prefer not to use this since it means less counted pageviews (=less impressions on the banners), but for the user it's a much better experience. Toughest part of endless scrolling is handling location when the user clicks 'back' to your site after they clicked on a link out...
When implemented properly both should not have a negative effect on your SEO traffic. Especially an endless scroll is easily implemented if you know a bit of coding. All you do is create an actual link to the next page. As soon as that's about to show you start loading it through an API and prepend it to the link. A search engine will actually follow the link (since the endless scroll isn't triggered when google bot loads your site), but the user gets freshly loaded content added. Another plus of using this method is that users without scripting enabled get the link which they can click
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