Here are my five relationship rules for Facebook (hint: they all start with don't) ...
1. Don't use Facebook to spy on your partner.
If you're in a relationship and are having issues with trust, it's all too easy to start spying on your partner using Facebook. Note: you may not even be experiencing trust issues with your partner in the first place — but Facebook can often engender feelings of jealousy that send you into a rabbit hole.
Some people go beyond the innocuous picture-spying and actually log into their partner's Facebook accounts to read their private messages. I've worked with many couples where this has happened, and the outcome is always bad.
If you're feeling insecure or having problems trusting your partner, don't spy on their Facebook page. It will not help anything, and will likely just exacerbate your issues — individually and collective.
Instead, deal with your trust issues. You can go to therapy alone, or with your partner. Or you can choose to deal directly with your partner and engage in a difficult conversation. Either option will always lead to a better outcome, even if it requires more than just a click of a mouse.
2. Don't use Facebook to compare your life to the lives of others.