A quick and simple way to visualize the usage of data derived from Mapillary street view photos is to use overpass turbo.
Check out http://overpass-turbo.eu/s/7JX for more details.
Comment from Sanderd17 on 19 February 2015 at 19:51
AFAIK, it's a tendency to use source=* on changesets, not on objects (that was the old habbit).
Sadly, overpass doesn't offer changeset-based queries, so that wont be possible. But I guess the real number is a lot bigger.
Comment from pizzaiolo on 20 February 2015 at 00:50
Good point! I don't use source=* on objects very often, but when I use Mapillary as a source, I always make a point of adding that bit of info to the object.
Comment from frodrigo on 2 March 2015 at 11:19
You can look at this for Mapillary, but in changeset comment, not source :