This isn't useful with such a small sample (821 jobs) without knowing where the sample comes from. Is it just jobs in SF? Is it small companies only, or does it include large ones? Is it only web companies?
If, for example, this were representing 100% of job postings, I doubt Python would be so much higher than C# or Java, and I'd be surprised to see Ruby so high either. But if this skewed toward startup jobs, then the numbers make much more sense.
