Title: I've seen a lot of great referral and invite programs, they're definitely a great way to bring in new users and reward existing customers.<p>There are also a ton of really poorly executed programs that result in spam and angry/displeased customers.<p>What are the Dos &#38; Dont's of Referral/Invite Programs? I'm asking specifically about non-free products. Gmail had a great invite system but it was totally free.<p>Two good examples I can think of off the top of my head are Linode and Dropbox.<p># Linode
"You refer someone and they use your referral code during sign up.
They keep a Linode for 90 days.
You then receive a $20.00 credit applied to your account."<p># Dropbox
"Invite your friends to Dropbox!
For every friend who joins Dropbox, we'll give you both 250 MB of bonus space (up to a limit of 8 GB)!"
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