Vine, Instagram, LinkedIn, Twitter...???

Can anyone help me? I can't keep up with all the social sites my WH is on. I have passwords to these and he knows I check his Facebook often. MySpace played a part in ruining my marriage. It gave him the ability to connect with a former coworker he had his business trip drunken ONS with five years later, he told her he was coming into town with work. I also found a second message to another former coworker on there, again telling her he was coming into town. I can't get past these messages. They haunt me more than the image of the ONS. His MySpace is inactive. I check Facebook often now that this has all come out, he went thru and cleaned out his friends with me. But, he continues to add social apps to his phone. I can't keep up with these sites now that I'm back working. Do I need to be concerned with Twitter, LinkedIn, Instagram and just recently Vine? The bad thing with Twitter is although I have his password I don't know who these people are, their usernames are different than their real names. Same I discovered with Instagram. Are there ways they can chat or send messages to each other thru these apps? Thanks.

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