Share photos with friends and family:  facebook.com
Talk to people online in other countries: (headset required):  skype.com
Let everyone in the world know what you are doing at any time: twitter.com
Store photos online and share with friends, family and the world:  flickr.com
Find current information about anything: wikipedia.com
Make videos and broadcast them: shortbrain.tv
Test Your Vocabulary and Feed the World: FreeRice.com
Upload a video or watch a video on you tube: youtube.com
Make a blog: blogspot.com
Keep a journal for yourself or for friends: livejournal.com
Search livejournal: jseek.com
Track visitors to your blog, see where they are coming from: activemeter.com
Manage your online identities: oxiam.com
Another twitter like site: pownce.com
Write something and publish it online: helium.com
Make an online social network: ning.com
Write book reviews for your friends and others: goodreads.com