Text this: 18 million links in commit messages: purpose, evolution, and decay

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| |  | ||  /_   _// | |  | || | || | ||  /_   _// 
| |/\| ||   -| ||-  | |/\| || | || | ||  `-| |,-  
|  /\  ||   _| ||_  |  /\  || | \\_/ ||    | ||   
|_// \_||  /_____// |_// \_||  \____//     |_||   
`-`   `-`  `-----`  `-`   `-`   `---`      `-`'