You don't really know which social networking sites you create will take off or succeed.

I chose the first point, about creating social networking sites.  The main idea about this point is, that you never know what kind of social networking site will work. The two supporting ideas are: there is no real investment into the start up, and you can make something that you like and not what you think the public likes.  While the main idea of this point is a good one, I think that the two supporting ideas are what need to be considered.  When we have the freedom to try anything we want with out having to invest anything more than some time and effort; then we are free to be as creative and open as we want.  This leads me to the second part, when you are able to make things that you feel passionate about, it can lead to designers creating greater pieces of work, what ever it is.