Although the word "hack" may have some negative connotations, the Open Web community uses it in a positive context. To "hack" something is simply to take something that already exists and change it to make something new. You can hack physical things- like board games or you can hack the web. Hacking has always been a key element in the creative process. It is a constructive collaborative activity, not a destructive one.
We have an unique definition for hacking. When we say hack we are talking about remixing content to make new things for the web. We mean hacking as tinkering. We are not implying anything malicious or illegal.
There's lots of great posts on the topic. Here's a random sampling:
Why Mozilla is Teaching Kids to Hack
I Hacked John Green's Website
When Hacking Is A Good Thing: Using Hackasaurus to Teach Argument
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