EXOBRAIN
GEO
FOURSQUARE
FACEBOOK
...
SUBSCRIBER # Should join these. How?
FACEBOOK
TWITTER
...
SUBSCRIBED
FACEBOOK
TWITTER
...
Eg: EXOBRAIN_GEO_FOURSQUARE
EXOBRAIN
GEO
FOURSQUARE
FACEBOOK
...
SUBSCRIBER # Should join these. How?
FACEBOOK
TWITTER
...
SUBSCRIBED
FACEBOOK
TWITTER
...
Eg: EXOBRAIN_GEO_FOURSQUARE