instaGrok is a next-generation research engine intended for academic settings to allow students to research any subject and see results in an interactive concept map, or “grok.” The grok features key facts, concepts and their relationships, images, videos, quizzes, and a glossary. Students can pin the information that they want to use to their grok and keep a bibliography or research notes in an integrated journal.
What makes instaGrok indispensable to teachers is its ability to facilitate self-directed learning of several critical skills, including researching and integrating discrete concepts.
My note: App for Android and iOS tablets is NOT available for smartphones and iTouch
Users do not search for anything in particular; rather, they spend time on StumbleUpon for one reason only: to discover new content that matches up with their interests. After StumbleUpon users document their interests on the site, the only thing they have to do afterward is click the “Stumble” button – sometimes over and over again. StumbleUpon itself works completely based on user preference, based upon whether somebody gives your page the thumbs-up. The more “likes,” the more StumbleUpon will send your page out to other users.
Read more at http://www.business2community.com/online-marketing/might-surprise-stumbleupon-0684002#sojZYu7X4OLoUuhq.99