Source: Grunwald Associates LLC
The focus of the study was K-12 instruction; however, much can be learned from the results of this study that apply to the uses of social networking technology in general.
The list of "popular" uses itemized by Grunwald certainly seems to support the idea that the biggest uses of these tools are simply unidirectional (posting messages, downloading media files, updating personal information). While these types of uses could be utilized in a self-reflective learning environment, however, actual "social" skills seem to be lacking.
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Source: T.H.E. Journal