Facebook is making their site nearly worthless for companies and personalities that have worked to build audience. Facebook is motivating me to try to figure out Google+ once again, and to rely more on Twitter. Also, "just for fun" pages helps to keep facebook alive and most people go there to stay entertained (not only by their friends news). Facebook will eventually start getting boring and people want to try new things, other social networking's, the butterfly effect will do the rest.
Facebook is just a dumping ground for 'the best of reddit'. It's just full of pointless shit and often videos of people having hardcore sex. It won't last forever, no one has set precedence for a social network maintaining it's growth over time.
It's a situation just like Myspace, it was popular till something better and more interesting came out.
Have you ever tried to succeed on Twitter or Google+ or even Youtube? Facebook is still the easiest way to make money these days. There are more audience targeting options on facebook and many more ways to promote your fanpage. But everyone knows Google+ is mostly used by technical men, and Youtube has tons of spam competition already and Twitter might work, but what's the reach on posts there?
