When you (and your significant other) make a decision to go on a journey that ends with one of the biggest and most important transactions in life - i.e. buying a house or an apartment - looking into your real estate agent is not the first thing on your mind.
Facebook is the de facto social networking site today, but you shouldn't forget about the rest of the sites, since their services are used by quite a lot of people as well. They are somewhat different from Facebook, so there are a few guidelines to consider when using them.