Collaborative coding

I would promote this idea to a higher level than just 'snippet sharing'. I can envision something called collaborative coding.

Collaborative coding embraces the uniquely identified code snippets but enhances it with a timestamp of modification and user comments.

Say,

/* Calculates the fibonacci number for the parameter
guid: {1c125546-b87c-49ff-8130-a24a3deda659}
date: 2009-04-25 19:00
comm: First version */

int fibonacci(int n) {
if (n<=2) return 1;
else return fibonacci(n-1)+fibonacci(n-2);
}

/* Calculates the fibonacci number for the parameter
guid: {1c125546-b87c-49ff-8130-a24a3deda659}
date: 2009-04-25 19:25
comm: Can't use recursion as my stack is too small, changed to an iterative version */

int fibonacci(int n) {
if (n<=2) return 1;
int j = 1;
int k = 1;
int ans = 0;
for (int i = 3; i <= n; i++) {
ans = j + k;
j = k;
k = ans;
}
return ans;
}

Then tools can show diffs over time of the different versions of snippets, with comments (if available) and be made to push back the snippets to available repositories.

You could actually end up having conversations in code. The identifier should identify function, and diff algorithms can show what has been changed and hopefully why.