You can't stop it, but you can make it difficult and do things to detect it like you said with the IP's.
Tom Gullen
2010-08-26 09:32:15
+1
A:
IP check may "close" whole network because of one user, so it may not be the best solution
Ilian Iliev
2010-08-26 10:12:36
+4
A:
Use a confirmation code that is sent to mobile no upon registration. and confirm it. like google.
org.life.java
2010-08-26 09:33:52
A:
You can get a lot of data from user, not only IP but also browser version, sended headers in request, even resolution etc. with javascript. Rosolve IP to region etc. But it's not simple to write a system that would search all of that data for similarities.
You can also set cookies or even do a little swf object with cashed some information on user local hdd.
killer_PL
2010-08-26 09:36:13
A:
You can send mail confirmation... and don't allow multiple users from the same mail!
This is fast and easy to implement :)
Wolfy
2010-08-26 10:08:46
true, but if someone want multiple accounts, he need multiple mail...you can't stop multiple acc, you can only make them work harder to have it ;)
Wolfy
2010-08-26 10:25:21