What is the numbers in profile mean?

@jilshi (271)
Malaysia
May 28, 2009 8:31am CST
I got no 45 and i know that is my number of post. I saw some member's profile star is yellow and got number 7. What is it means? Why my I don't have a colour star yet? How can i get a star?
1 response
mye_drew
@mye_drew (182)
• Israel
6 Jun 09
no idea...