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Google Apps for Education app: https://www.google.com/enterprise/marketplace/viewListing?productListingId=17789+13349884249762973052
Google Chrome app: https://chrome.google.com/webstore/detail/instagrok/flonaffkffjppejcafgpdgilebfikemd
Edmodo app: http://www.edmodo.com/publisher?uid=7493337
Website: http://padlet.com/
Google Chrome app: https://chrome.google.com/webstore/detail/padlet-wallwisher/ppckapbnfhikdajgehibjapcohbaomhd
Google Chrome app: https://chrome.google.com/webstore/detail/diigo-bookmark-archive-hi/oojbgadfejifecebmdnhhkbhdjaphole
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Google Apps for Education app: https://www.google.com/enterprise/marketplace/viewListing?productListingId=13045+661590233363337669
Website: http://www.symbaloo.com/
Free Android Phone app: https://play.google.com/store/apps/details?id=com.symbaloo.android
Free iPhone app: https://itunes.apple.com/us/app/symbaloo-bookmark-share-your/id521081559?mt=8&uo=4&at=10l6SU
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Free iPad app: http://itunes.apple.com/us/app/zite/id419752338?mt=8&ls=1&uo=4&at=10l6SU
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Website: http://delicious.com/
Website: http://edu.symbaloo.com/
Free Android Phone app: https://play.google.com/store/apps/details?id=com.symbaloo.edu.android
Free iPhone app: https://itunes.apple.com/us/app/symbalooedu-organize-share/id536165032?mt=8&uo=4&at=10l6SU
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Free iPad app: https://itunes.apple.com/us/app/learnist/id522850398?mt=8&uo=4&at=10l6SU
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Free iPhone app: https://itunes.apple.com/us/app/educlipper/id737584066?mt=8&uo=6&at=10l6SU
Free iPad app: https://itunes.apple.com/us/app/educlipper/id737584066?mt=8&uo=6&at=10l6SU
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Google Chrome app: https://chrome.google.com/webstore/detail/storify/oonhlodhpiagekajjhhfimfgeagjnnop
Website: http://www.19pencils.com/
Website: https://paper.li/
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Free Android Phone app: https://play.google.com/store/apps/details?id=com.historypin.Historypin
Free iPhone app: https://itunes.apple.com/app/historypin/id455228207?mt=8&uo=4&at=10l6SU
Website: http://list.ly/
Website: http://primarywall.com