Step Four: Cross-Reference the Location in the Information Being Verified with Locations in other Messages from the Source
The final step in determining if this person is a primary source is by looking at other social media messages posted by the source. Is the location in the information you are trying to verify the same or close to the location of previous messages from the source? If the locations are far apart, than the source is probably a secondary or tertiary source. If the location of your information and previous messages by the sources are the same, than this person is most likely a primary source.
For reference, follow the flow chart below to determine if the source is a primary, secondary or tertiary source, or if they should not be used at all.