Brian,
It's possible your transport failed to load. One way to check this is to deploy your jar file and then go to the log page and see if there are any messages with the words TransportTracker. Likewise, you can look for messages from the logger org.apache.felix.fileinstall for clues. If your transport deployed successfully, then you'll see likes like the following:
com.esri.ges.registry.transport.internal.TransportRegistryImpl [TransportTracker] Transport Twitter(10.2.0) added from bundle com.esri.geoevent.transport.twitter-transport [343] (ACTIVE). Wed Mar 26 13:49:26 PDT 2014 INFO
and
org.apache.felix.fileinstall Installed /home/gep/arcgis/server/GeoEventProcessor/deploy/twitter-transport-10.2.0.jar Wed Mar 26 13:49:26 PDT 2014 INFO
Let us know if you have any further questions.
-Javier