The US Army is advising against posting images from your smart phone to social networking sites. I think this is advise that us civilians should also consider. At least we all should understand the potential risk to our privacy posting photos with location metadata. The following presentation (pdf) provides details on why it is risky to post such metadata to social networking sites: http://dmna.state.ny.us/members/geotagging.pdf
If you want to post photos, I recommend sanitizing your photo metadata first by removing the location metadata particularly if this information can identify personal information such as where you live, work or play. If you don’t have a tool like LightRoom or Photoshop where you can edit the metadata, there are some free tools that can help. Google “remove photo metadata” and you’ll find a number of articles and tools to help you with cleaning up the location metadata.