Can you promote other people's services to get affiliates?

Can you promote other people's services to get affiliates?

I need to know if I can promote other peoples gigs on social networks/blogs and still get credit for the affiliate sale. For instance, it says in the affiliate section that I can add the linkin code to MY OWN gig URL and if someone comes to the site and is a new user, I will get credit for that affiliate sign up and make 10% of their purchases for life.

I suppose my question is, can I add my linkin code to other people's gigs and get credit for that affiliate when they sign up for seocheckout? If so, that would greatly help my advertising efforts. Because the gigs you people offer are Very amazing and attractive to my follower base!