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Many, depends on what you want to use them for:
Good luck!
I am surprised at the replies of "professionals" who have no idea what the question means.
Antavo is good one
It has a free trial version and other packages start at $25.
Features:
invite friends through their social media channels (Facebook, Twitter, tumblr and email) after they have entered.
- Bonus points for sharing
- Unique link to share in email
- Auto message if a friend decides to enter from their shared link, then the participant will receive an email about the amount of bonus points they will be awarded.
Know in this tim i used gmail to connect with people and another social medi
thanks for invitation
I do not beleive that there is such as thing for only refer a friend, however every app can have the same feature via other connections integrations such as gmail, or linked in account or anyother social media
I fully agree with Merwyn Machado's submission.
Thanx for the invitation
Realy i do not know !!
But thank you for your good question and for invitation
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