We have 2,988 questions, 6000+ answers, and 2000+ users. Half the sites represented on the Data Explorer cannot boast these numbers (many of them Metas). When is my site going to be added?
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I don't have confirmation this is the case, but I would suspect that Mathematica will be added the next time that Data Explorer receives updates.
This has been held up by the recent slew of hardware and software updates, but it should be completed once the dust settles. You can expect more frequent updates then, as well.