Forums: Networking sites where people can express their opinion about something determinate.
Social Networking Sites: spaces in the web where you can chat with your friends and contact with everyone. You can see pictures, videos, links about them, comment it and like it or not.
Facebook: it’s a free social networking site, probably the most used by the people. Mark Zuckenberg was the inventor of Facebook. People post photos, comments, videos and links in it, and the contacts (or friends) can say whether they like what is posted or not and they can also leave a comment.
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Slideshare: it’s a space in Internet where you can share presentations with your contacts. You can upload your power point presentations so that other people can see what you’ve done.
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Pinterest: it’s a space in internet were you can stick photos of whatever you like in different “tables”. Their friends can comment the “tables” and say if they like it or not.
Wikispace: it’s a networking site where you can find information of all you want. People write what they know about some issue.
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AppInventor: it’s a site where you can create your own apps. It has a lot of tutorials about how does it works and it helps you to design an app.