I recently saw a headline to an article that said: "Why Do We Say "Like," Like, All the Time?" I have not yet read the article, but I believe because it is a careless interjection as using “er” or “uh”.
Why do we people use this interjection? They might not have a firm idea of what they intended to say. They are not comfortable speaking in public. They have a low self-esteem. They are careless. They very much want to fit in with their peer group: all the others use "like" (like it's cool, the in thing). “Like if you want to fit in with us you must use the word, “like”.
It's a bad habit as feeling you have to start the answer to a question by starting the first sentence with the word "So, ".
