On my facebook I have 175 "friends". They may be neighbors, family, people from church, previous acquaintances, previous work friends, forum friends, and friends/relatives of family. Facebook allows you to choose if you want just the friends to see what you have to say or anyone. I am able to see what is going on in the lives of all 175 friends when and if I want. I can make a quick comment to one or 50 if I want. I can view pictures they post and not say a thing but see how their vacations went and the funny costumes the kids had for Halloween. I can post pictures to albums there directly from my computer. I can send private messages to anyone. I can contact several people with the same message. For instance the other day after Pete installed my "over the stove" microwave, I messaged JUST our 5 kids and asked them if they wanted it, all at the same time. I can make up a group like our close friends and family who we invite to our summer car party and keep them apprised of when and where etc. I did the same thing with our cousin party. People use the groups or a page for special interest stuff like hobbies or a favorite restaurant. If somebody gets mouthy, you can block them.
There are absolutely gobs of games and fun things to do. A lot of the games allow you to interact with other people to help them with the game or hinder them from doing well. Some are word games, some are Mafia wars (have no idea) some are farm type, some put together a home in the city and decorate it, some have something to do with a cafe and cooking. It has a one on one chat capability.
I have only done one game and it was called Farmtown. You were given a piece of property and a little money and you bought seeds to plant and when the stuff grew in a few days, you harvested it, went to market and sold it to get more money to buy more seeds, buildings, animals etc. When you were at the market, you could hire other people to harvest for you or work for them. People would chat while they waited to get hired. It has been several months since I was working mine so it may have changed since then.
So you see, it is quite different from a forum.