Hi,
We need to allow our users to invite friends using their address book from popular email services like gmail, hotmail, yahoo, rediffmail and also from social networks like facebook, orkut etc.
There are many sites like
Openinviter.com
Invitebox.com
Cloudsponge.com
ContactGrabber.com
GetMyContacts.comsuper-tell-a-friend.com
inviteallfriends.net
smartaddon.com
(found them by searching Google)
However, I am not sure of their reliability. Im wondering what most successful and serious startups are using to allow their users to invite their friends.
It should be reliable and easy and work with PHP/Yii. I would love it if its free but its also ok if there is a small monthly fee.
Any suggestions?