People around the world are coming together on Friday to celebrate the world wide web.
Web creator Tim Berners-Lee will be taking part in the celebrations
Susan Crawford, the founder of OneWebDay, said she wanted people to reflect on how the web had changed their lives.
The day will be marked with events taking place around the world, together with online activities.
The organisers are planning to create what they hope will be the largest global online photo collaboration.
Web users are being asked to tag their pictures with OneWebDay and upload them to photo-sharing sites Webshots and Flickr, to create global photo albums.
The organisers are also encouraging people to post entries to their blogs on Friday which reflect on how the web has changed their lives.
Alongside, a number of events will be running around the world. Craig Newmark of networking site, Craigslist, will be talking in New York, while other events are taking place in London with Tim Berners-Lee, and in Belgrade, Vienna, the Philippines and Tokyo.
Virtual world, Second Life, will also be involved in the celebrations.
Susan Crawford, a law professor at Cardozo School of Law, New York, said: "I am hoping that people will take a step back and recognise how much the web has changed their lives over the last ten years, and reflect on how they would like the web to change the world in future.
"I also want people to see themselves as having a connection to the web - the web is made of people. It will be a moment of reflection and celebration."
This is the first OneWebDay, and the organisers plan for it to become an annual event.
Bloggers are marking OneWebDay around the world. Here are a selection of bloggers who have written about the day or are marking it in some way:
I'll raise a glass and celebrate the fact that I can talk to people worldwide about wine. I don't even have to cycle out to see them.
I can watch harvests from my garden, I can browse recipes from my kitchen and I can order wine to be delivered from my bed.
The internet has made my life so different than it was before. And so much better.
First wave was email and research, in 1992, when I needed Supreme Court case law from the Cornell Law School website, or a news article from Dialog, or bulletin boards. Oh freedom from the law library for every little task.
Second wave was IM, more email with many more people and the web. Instant. Communication. Conversation. And all that primitively laid out info on the web. That was never so easy to get before.
Third wave was blogging (which has totally changed my life the most of all these waves) and lead me to research the live web, search algorithms based upon human behavior in many different types of circumstances and make my company. And introduced me to a whole huge circle of friends and colleagues.
Skype a friend. Skype a stranger. Turn on SkypeMe mode for the day.
How the web changed my life: well, I used to work in tv and film and had to get up very early. Which was no good as I'm emphatically not a morning person (not really a night owl or a middle of the day person either, for that matter).
Now I make my living more or less directly from the Internet as I've worked in Internet policy for the last six years. So that's pretty obvious.