When you do certain activities on WriterBabu you gain reputation points or score which indicates that you have been active on WriterBabu since sometime. You gain more reputation points when other WriterBabus appreciate your work like give you a better rating for your post.
200 for each book published
10 for each post user posts ( which is his/her original creation)
5 points for each post you comment on
3 for each poll user takes
1 when a person visits user's post (no longer contributing)
1 for each "hummm" rating on user's post
2 for each "nice" rating on user's post
3 for each "hats off" rating on user's post
4 for each "speechless" rating on user's post
And there are corresponding reputation gains with the badges too, checkout the Badge page ( http://www.writerbabu.com/badge.php)
Every author that joins WriterBabu through your invitation contribute one fifth of their own score towards your reputation points since they cross 30 points up till 500 reputation points. Which means maximum reputation that you can gain by inviting a friend is 100 ( one-fifth of 500).