From a lovely blog by a Spanish teacher, this post insightfully reviews a comprehensive and excellent choice of curation tools in several categories:
CLOUD STORAGE: DropBox, Evernote, GoogleDrive
RESEARCH: social bookmarking tools: Diigo, Zotero
VISUAL BOOKMARKING: Pinterest, Learni.st, Bo.lt
SOCIAL BOOKMARKING: folksonomy, Delicious, Diigo, Zotero, Pinterest, Learni.st, and Bo.lt, Bundlr, Educlipper (in Beta).
PRESENTATION: Pearltrees, LiveBinders, Museum Box, Jog the Web, Mentor Mob.
MAGAZINE: Scoop.it , Storify, Paper.li, Flipboard
In the end, she recommends for education: Symbaloo, Diigo, DropBox, Evernote