I think you're completely right, and I'm a teenager, well legally an adult, but there's still a 'teen' in my age. So many people in my age group whine and complain about things they allegedly rally for, but when the time comes to actually act, they don't do anything. I recall a few years back a girl planned a cross country march in protest of the war. Of all the people who supported her, one other person actually marched with her.
They get all self righteous about 'being green,' and they'll complaidon when people throw out a piece of scrap paper instead of locating the proper recycling receptacle but they aren't really DOING anything but annoying people.
There have been some flare ups, like with Operation Chanology and Anon about a year and a half ago, but the problems still exist and so many people are over it.
You're right, teenagers need to put themselves into something that matters. We need to get angry and fight for what we feel is right. We need to realize that there is more to life than facebook and Jersey Shore and sh*t like that.