User Bookmarks plugin will allow users to bookmark any content they want, categories, posts, forum topics, custom posts, and also manage their bookmarks into collections. The plugin offers a simple way to show the bookmarks and bookmark widget and can be integrated into any theme. Use your account or login with demo account (username: test password: test) to add/manage bookmarks and collections. If you are looking for some dummy posts to bookmark, you can try all forum topics or example post. (you can choose which post types can be bookmarked)