Stumbleupon was a great tool to and social networking website that helps discover interesting things online.
There is some alternatives which are similar to Stumbleupon but they don't the interesting content fuelled by users.
We try to change that by building Bunklist.com, a website to collect and discover interesting website links through simple lists. Bunklist is social, you can follow your others, discover what they are bookmarking, their tags, add a comment on public lists, and more fun features.
We have also build a Shuffle, a StumbleUpon alternative to discover random websites posted by Bunklist users. You can also Save the website which you like in to your list of bookmarks.
Let us know what you think what it?
Direct link to website - https://www.bunklist.com