IMHO, facebook is not just about the user. Some of you say that you have a facebook account, and you use it wisely. Wonderful. BUT when you’re talking about shidduchim and marriage, it’s NOT just you anymore. You will bezras Hashem bond with your spouse, build a home, and you are an example to them. YOU ARE THE ROLE MODEL. The question is really, do YOU want to bring facebook in your home? WHICH INCLUDES that your kids may abuse it? Do you want your spouse to be on facebook and POSSIBLY be hooked, or involved with things they shouldn’t?
Marriage is about getting to know oneself. With this, and with many other issues, one must ask themselves, what do I want MY home to look like? What kind of father/mother do I want my kids to have? It’s about growing up, and choosing your life.