This article by The Economist highlights the shortcomings of Facebook and MySpace etc, but its real real mesage is to highlight the advantages of Open Source software.
I just had another positive experience with Linux, this time at the lower end of the power spectrum. I installed distros on old 386 machines at a charity in Zambia to be an alternative to the heavy, slow and virus prone Win98, Win2000 and Win XP. (I partitioned the drives so that users can still choose Windoze or Linux.) Both DamnSmallLinux and DreamLinux installed easily (even running DreamLinux from a USB stick is easy and fast).