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In this case, unless they have explicitly connected their Twitter account and their Facebook account to your service while logged in, they will not be logged in
by nostromo 14y ago
In this case, unless they have explicitly connected their Twitter account and their Facebook account to your service while logged in, they will not be logged into their account.
It's a hard problem to solve. Some companies are asking Twitter OAuth users to provide their email upon connecting to try and get around it.