By using facebook.com you can access Facebook chat but it is not the only option to access Facebook chat. There are many reasons for using third party web tool to Facebook chat. It is able to connect other chat network within the same browser at the same time.

Here are offering 5 options:
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Chit Chat for Facebook (Web)
Athena IT Limited has developed this web-based messaging tool. The more inspired web-based solutions can find you and the desktop offering advanced version too. For this web Facebook chat it doesn’t require installation on the computer. Along with this they designed a tabbed instant message window with speech bubbles in different color. It helps to understand easily that your friend is offline or online. The offline represents the red color and online in green color.
The merits of using the Chit Chat for Facebook (Web) over Facebook.com:
Before engaging in chat, search your Facebook friend list.
Well-designed interface
Use speech bubbles in the conversation window
We can insert format texts as italic/bold and emoticons
Full screen instant messaging
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Plus.IM
It refers product identity or the domain in a popular multi-network connectivity tool. This is for those who like mininalistic tools. We can open only one conversation window at a time. It feels lacking round the edges and it offers a contact search tool like chit chat. Chit chat is a better chat solution on Facebook for those who wish to use multiple networks at a time. The IM+ is a superior.
The merits of using IM+ over Facebook.com:
Before engaging in conversation search your Facebook friend list
You can connect with several chat networks at a time such as AIM, Google talk, ICQ, MSN, Yahoo, and of course Facebook.
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Meebo
It is also a tool to connect a number of networks at a time. Comparatively fewer networks can connect through this tool.It is mainly focused on the popular networks such as MySpace, Facebook, MSN, AIM, ICQ, etc. Meebo feels more solid and less static in technological production by comparing to IM+. The desktop instant manager and the looks and feels of the product are similar.
In pop-up window each conversation is launched in separate pop. For the simple use and to minimize prefer tabbed solutions. The emoticons and text formatting are supports meebo.
Merits of Meebo over Facebook.com
Before engaging in conversation search your facebook friend list
You can connect with several chat networks at a time such as AIM, Google talk, ICQ, MSN, Yahoo, and of course Facebook.
Trendy interface
Customize the desktop background for possible to make your instant messaging experience.
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ILoveIM
It supports Facebook, Yahoo MSN, and ICQ and Google Talk chat networks. It has been built around windows messenger and it looks like the instant messaging experience. You can find the Microsoft’s MSN emoticons that only support windows live messenger such as nudging, font, style, color, and text size. It is convincing and stables the integration of Facebook. Your Facebook buddy images do not display the web-based messaging service. Meebo and ILove.IM platform feels extremely similar.
Merits of ILove.IM over Facebook.com
You can connect with several chat networks at a time such as AIM, Google talk, ICQ, MSN, Yahoo, and of course Facebook.
Trendy interface
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LiveGo
In terms of Facebook integration it goes the extra mile. It supports feeds, display of your messages, album, friend list and of course chat. The ASCII icons rather than graphics will disappoint the insertion of emoticons. It is trying to be encompassing social communicator and it helps to chat well. It provides solution for the problems like blocking in itself.
Merits of LiveGo over Facebook.com
Connect to social networks like Twitter, MSN, AOL, Gmail etc.
Bypass restrictions that school filter or your work has on Facebook.com feeds
Tidy interface