I will tell you what will destroy Facebook: A FB-like Dropbox-frontend. Something that allows you to share whatever you want to share, blurring the boundary between local and cloud by making "the cloud" just a directory on your device.
Wuala works a bit like that, with a somewhat clumsy UI though. Your files are also accessible from Wuala's web servers and you can start "groups" with members who can comment on the group, members, files (through Wuala's file system integration on Windows)... It's not really being used actively though, which is a shame - and the UI needs to be fixed.
So, while I do not like simple comparisons like "is Google the new Microsoft?", they have their share of morality issues like most large corporations...
Suggestion. Don't assume that any of the rest of your working life will in any way resemble your time in college. It won't. If you're not somehow independently wealthy, you're in the slave system we call "employment." Get used to it or get out.
So someone who disagrees with you must be a young college student and they make you feel so inferior that you try to give them a hard time as an employer? I'm sorry to burst your bubble, but my uni time was 17 years ago and I've been an employer (who buys desktops but doesn't think it's relevant here since the users usually don't have a choice regarding OS) for 12 years. I find employers who think they have to keep up a "slave system" pretty desperate...
I would argue that you learn more from the failure than the success.
That depends on the situation. I'd say you learn from trying (from each attempt), whether you fail or not. If you fail, you might have another go more quickly but if you succeed, you might learn other things along that path.
"The identical is equal to itself, since it is different." -- Franco Spisani