[vellum]

It's one heuristic out of many, and it's a fast one. If you go through all 10-15 github profiles, and you find an awesome programmer, than you're done for that point in time. If you don't find any, you can use a more time-consuming heuristic.

[tedunangst]

Throwing out resumes with spelling mistakes is even faster, and if you don't find anyone, you can always go back. The same can be said for any filtering technique.

[flakmonkey]

The problem here is that a resume with no spelling errors says nothing about a persons coding ability. The resumes without errors are lacking the negative indicator of poor spelling/formating. A strong Github profile, however, consists of many code samples and is a positive indicator of coding ability, making it a much more useful metric. This doesn't imply a knock against programmers with no Github profile, simple a leg up for those who do.