 
Spots are a basic idea of this site. One problem with searches is how the city may not be the best way to post a request for a ride share. Spots address this by specifying a location by an easily searchable string.
Spots can also work even if there is no city nearby. Perhaps you live in a community that is not listed on the map, stuff like that. Google maps can display a map based on latitude and longitude, so it is very easy to determine exactly where a person is from or wants to go. Spots avoid miscommunication in this way. There should be some way to tack on the radius of a spot. For more on calculating spots, see calculating a spot. Spots are a wee bit more difficult to harvest and profile. Certainly posting your street address for a ride across the country puts a big old blinking light that you will be away for awhile for all to see. One interesting thing about the above, is if you posted your spot on a page that search engines hit, then anybody would be able to find your spot.
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