Chatsum is a FREE add-on for your web browser that lets you chat with all the other Chatsum users that are looking at the same website as you.
Chatsum lets you:
Let's see how it works by looking at the Firefox version:
Chatsum appears as a sidebar in Firefox and monitors which websites we're looking at. Here Chatsum knows that we're looking at news.bbc.co.uk and is telling us that there are 3 other people looking at the same website. Chatsum also shows us the last few messages to be left at news.bbc.co.uk
Using Chatsum we can chat to the other people here by typing messages into the text box.
Chatsum allows us to switch between two modes of chat - 'Site' and 'Page'. Site chat allows everyone browsing a specific site to chat in the same room. Page chat lets you chat about a specific page of a website
If you're not sure where to start, just open the 'Places to Chatsum' drawer. This will show you the most active and most commented on websites, as well as the most recent comments left by Chatsum users. Just click on a link to go straight to that site and join in.

