Is it policy not to show links in a question?
The number of questions asked about Google Maps without a link to a map is large. An actual map can show show the problem and help debugging.
migrated from stackoverflow.com Oct 5 '12 at 2:31
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Links are certainly allowed in posts. Users with less than 10 reputation are restricted to posting at most 2 links per question or answer, but other than that... there are no particular limits so long as the links are relevant.
If folks wanted to add a link to a map, they can certainly do so.