Litter Layer started out as search only. Now there is a federated portion and social bookmarking with commenting. Users can even customize a public bookmarks page with CSS. Privacy and 100% control over your account is a priority. Setting up a node is easy and works even with cheap shared hosting, and comes with a search widget for your site. Bookmark search results, or add any bookmarks you want and they'll be added to the search engine. Create a fun avatar (cartoon or shapes).