In 7 months you have 7 direct referrals. I think that is a pretty good start!
There have been a few very good threads in the forums that explain what others are doing to attract referrals to ClixSense. Some are using traffic exchanges, other advertise their referral link at other PTC sites and mention ClixSense to friends, family, on social network sites, etc.
I think you are off to a great start! Keep doing what you have been doing and success will keep coming your way