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You can manage your friends list easily to always accept mail from friends

You can confirm that your database YAML file is being parsed properly.

You can chat, download files from friends, view their photos and share files.

You want to know what others are doing on your own computer.

You can simulate the MySQL group_concat aggregate.

You may need to obtain ruby.st for Ruby syntax highlighting.

You can use HFS (HTTP File Server) to send and receive files.

You want to render an Excel file inside web browsers

You can convert any format video to WebM for html5 video.

You can use this to export the strange Wordpress RSS file format.