DIY--public portfolio under parents' or teacher's email account. Designed for kids. Kids can upload videos and images of projects. Fairly new and worth exploring.
If you want to bundle websites (URLs) for your students into one link, this is a really sensible solution. Free and very simple to use--just paste URLs and it links ('stitch it').
"Fast layout and customisation of photos, video, text and music.
Add media hotspots, narrate interactivity. Publish to any webpage" Lots of recommendations, many of which are in RWL 513.
ICT Magic was selected as the best educational blog for 2011. I particularly like this page (which has links to lots of resources) from clip art to virtual destops.
Edumodo has lots of potential for teachers and students; you can control who is part of the group and you can monitor, two important considerations with social media and students.