Out of interest, did anyone get the locations parameter within the twitter input connector to successfuly work?
Cross Reference: ArcGIS GeoEvent Twitter Module: How to get USA-Only Tweets?
I believe I found the solution, I did the following to get tweets from a particular geofence only.
1. Import the polygon as a geofence on the SITE tab
2.Add the same polygon to the Geoevent Definitions
3.From the Geoevent Services tab add a filter.
4. Use the following syntax below.
That I believe solves the problem.