they are also active on the internet but don't know about bitcoin
thats why need advertising
So then why not start yourself to advertise Bitcoin? The easiest is by word of mouth. Organize a meetup or do some presentations.
Their is always a simple and easy possibility to support Bitcoin.
I've done every day in facebook, I don't do advertising to the extreme, because I don't get paid for it
You won't get paid for obvious reasons, to make people more aware of Bitcoin. Your reward is the higher price that you will benefit from in the very long term. Helping the community isn't a job, it's something we do out of love for Bitcoin.