LinkWithin is an online free service to show the related posts at the end of each post on your blog. Generally we show up the related stories by using some PHP codes, but LinkWithin shows that in a little bit different way.
The related posts will be shown in an image where the text will also appear. I checked that on thenextweb and they are using this service on their blog. If you are a wordpress user, you need to download a plug-in from the LinkWithin site and activate that on your blog. Now rest will be done by that plug-in itself.
The related stories will appear like the image below, you can have a look on thenextweb posts to see the real look,
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