title: Can I store approximate geographic data using PostGIS or a similar service?
body: <p>I'm writing a web service using Rails where ads can be posted by users. These ads can have location data attached to them, and I'd like to leave the granularity of this open to user choice, so they can add an exact location, or just town/city.</p>
  <p>I was planning on using PostGIS, but as far as I can see it only allows exact points to be saved. Is there a way around this, an alternative solution, or do I simply need to abstract this myself?</p>
  <p>Thanks.</p>