I have all sorts of conflicted feelings about my time with SA during the Bush years when I was a college student. It was fun, but I think the time I spent there cost me a point or two off my GPA. The people I knew of that went off to the Microsofts, Googles, Apples, and various startups of the world were more focused in their studies and their technical passions and didn't pay too much attention to many of the things…
When you look back at those successful people everyone so desperately want to be, in tech a least, they often frequent various types of message boards.
Reading forums won't cause you to not be successful in life. Not doing stuff will.