I can't agree more with you on this, because posting here on ALTT and on BTT has made me a better reader and a writer, I can write and read, faster than before. It helped me in my exams too, because English is not my native language, it's like my 3rd language but the most important one. I have to write in English for my exams, and it helped me to write long paragraphs without breaking the flow. And I also think this is the main reason behind my high GPA.
Well, besides, this whenever we have to make a reply or creat a topic, we do research before publishing one, and that research opens new information to us and this act like reading, and getting knowledge, I did not read that much news when I was on BTT but here on ALTT i mostly read news and they are really helpful in many ways.