How can we generate a link that can be clicked on by 5 different people on a Social Network game, so that each of the five people can get a bonus? The link will be published as a "newsfeed" on the Social Network such as Facebook.
The link shouldn't be easily "generated" by any people as a cheating method.
Also, what database table(s) should be added to handle:
1) the bonus can be claimed up to 5 times
2) must be claimed by different people
(each person has a unique numeric ID on social network platform such as Facebook)
?