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May I request free advertisement for a ref. link? (I am "at least Sr. Member") 
. I will vouch for your service if it gives results (I can check both the number of clicks and, obviously, sign ups).
If not, it is OK. Good luck!
. I will vouch for your service if it gives results (I can check both the number of clicks and, obviously, sign ups).If not, it is OK. Good luck!
Why not sure .
First if all i cannot give any guarantee that they will signup or even come to your site. If your site is interesting then people will surely comes.
PM me your ref link. You can send me full tweet and i will post it for 3 days.