[keycloak-user] Social Account Linking support in Keycloak.

Hi, I have an application secured using keycloak 1.5. I have a situation where in an user is registered using a social login(say facebook). Now if i login the user using another social login(say google+) using the same email address as the former social login(fb) it say's that the user is already registered and gives an error. Is there any way to link two accounts that use the same email address but from two different social accounts or Is there a way in which keycloak recognizes the email address and the log's in the respective user. Thanks.