vi.sualize.us is described as 'A social bookmarking website for visual contents — vi.sualize.us allows you to remember your favorite images around the web, and share them with everyone. Sometimes, you are looking through pictures and one of them catches your eye' and is an website in the Social & Communications category. There are more than 50 alternatives to vi.sualize.us, not only websites but also apps for a variety of platforms, including iPhone, Android, iPad and Android Tablet. The best alternative is Reddit, which is free. Other great sites and apps similar to vi.sualize.us are Raindrop.io (Freemium, Open Source), Pinterest (Free), Google News (Free) and SaidIt.net (Free, Open Source).
Unsatisfied with the few link sharing communities that were available and their proprietary, untransparent and non-secure nature, ziq made the original raddle.me (then known as raddit.me) with Wordpress, but it had a lot of limitations.
We Heart It lets you create an online album (a heart) with your favorite images and videos. At the same time you can see what other people are adding to their own hearts and save it on yours to grow your collection.
Watch youtube / vimeo videos, listen to soundcloud audio, see images, read articles and visit website links and much more right from one dashboard, while saving your links in an encrypted form (Even we can't read them!).
News for nerds, stuff that matters. Slashdot (aka /.) is a technology-related news and discussion site with a focus on Linux, free and open source software and information freedom and privacy issues. The software it runs on, called Slashcode, is open source.
LinkAce is meant to provide a long-term archive of links to websites, media files or anything else which has a valid URL. Store interesting articles, neat web tools or libraries you may use sometime in the future.
"Highlights - Highlighter and Web Clipper" chrome extension by Learning Paths, helps you organise your content across the internet. Highlight, Tag and add notes to relevant content across the internet.