There are 3 main organizations that have defined 21st Century Literacy. All three definitions point to the same goal: that being ICT literate (Information and Communication Technology Literacy) is much more than just having good technology skills. It is learning core subjects with application of these learning skills and communication tools.
Schoology is a free web-based learning management system (LMS) built on a social network. Schoology leverages the familiarity of popular social media tools to improve communication and collaboration.
"Authors Who Skype with Book Clubs\n\nThese authors are willing to participate in 20-minute Skype visits free of charge. (Many also offer more in-depth virtual visits for a fee.)"
The following web2.0 sites would be useful for science educators at the high school and middle school level. Some would also be appropriate for higher elementary grade levels. There are many new 'tools' or websites that take advantage of the higher speed and bandwidth of today's Internet.