We usually hyperfocus on Google Place search and Maps results, since they have such large market share. But there are good reasons for local businesses to be concerned with ranking elsewhere as well.
It’s not surprising that many businesses focus mainly on ranking well in Google’s local results, but working to rank well in some other search properties often has the benefit of helping to augment one’s rankings in Google, too.
Ranking well in directories can give your listing a better signal in terms of linking weight or citation value on other sites, so performing well in local on subsidiary sites may help to build your rankings back in Google.
There are other good reasons to spend some time improving one’s position on secondary search engines, too. Diversifying your sources of traffic can help to reduce your dependency on the big Google mothership, which is always a good thing.
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