How can one deal with a wife's use of Facebook during the engagement period, and rebuild trust and love between the spouses after the disputes resulting from it?

We have previously warned against girls befriending young men on Facebook, but adding public figures like preachers to benefit from them is permissible, as it is usually far from suspicion. It is not permissible for a husband to access his wife's account without her knowledge, as spying is only permissible when suspicion arises to prevent an evil. He should not return to spying on his wife; rather, he should think well of her and cooperate with her in drawing closer to Allah.