When I invite friend from my twitter account, I have the error:

The following users are already members of this Drupal site
The connection to my tweeter account is successful but in the email column I have user id instead.

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hadsie’s picture

hadsie commented
Status: Active » Closed (duplicate)

I believe this is a duplicate of #537850: OpenInviter and Inviter not compatible for social networking sites

Basically OpenInviter doesn't return the email address for social networks, and that's what the invite module needs. Causing this to fail.