Board Thread:Fun and Games/@comment-24826734-20150312124553

Posts here for riddles. But this time with some rules.

Rules:
 * You all must solve the riddle that is last given in order to post another one
 * If someone got it right, the person who posted the riddle must say that he/she's correct. After that, the previous riddle poster shall not post another riddle until the riddle after that is solved.
 * You are free to discuss or take multiple guesses, but no off-topic comments.
 * Multiple riddles are aloud, but if one is solved, you can keep solving the second/third/whatever one until a new riddle is given by a different user.

Let's start:

I give you thousands of messages per day.

Without effort, you do what every message say.

You cannot live without me, I am always with you.

Who am I? 