I would like to include a method for importing contacts from common contact lists (e.g. gmail, hotmail, yahoo, etc.). I found openinviter.com, but am unable to get it to work. Specifically, the example.php code crashes when it creates the instance of the openinviter object.

Can someone suggest either (a) how to fix openinviter or (b) a good (free) tool to use for importing contacts?

Thank you.