A few years ago Facebook began as a networking tool for college students. Since its inception it has been firmly viewed as the turf of teens and twenty-somethings, however that is no longer the case.
According to statistics from Facebook, they have experienced a profound shift in their demographics:
The biggest growth in terms of absolute new users over the last six month came amongst users 35-44. Over 4 million more US women 35-44 and nearly 3 million more US men 35-44 used Facebook in March 2009 compared to September 2008.
Another fun fact is that women over 55 is the fastest growing demographic on the social networking site, expanding at a rate of 1.5 million people per month.
As the demographics of Facebook change, the manner in which people use it will too.
How will businesses and marketers use Facebook to spread the message? Or maybe the better question is how long will it take them to realize that Facebook isn’t just for kids anymore?
How will older users interact with each other on Facebook? There is no doubt that their reasons for joining and real world uses are and will be different than their younger counterparts.
Will teens want to join a social network that their parents are on? Will Facebook become viewed as old and untrendy in the process?
In my mind, these numbers raise many more questions than they answer. The only thing that I will say with confidence about them is that these changes will have a lasting effect.
The Geek Whisperer 
I just wrote a post about Facebook Addiction.
You might want to read it.