1. Digg
Digg is a popular social news site where users can submit their articles, blogs, and other content for voting and discussion.
2. Reddit
Reddit is a social news and discussion website where users can submit their stories, follow communities, and engage with others.
3. StumbleUpon
StumbleUpon is a social discovery website where users can submit their content, including links and videos.
4. Pocket
Pocket is a social news and bookmarking website where users can save articles, blogs, and other content for offline reading.