Not cool trying to use referral links, but whatever.
You can get free Bitcoins from faucets, which are places that provide very small amounts of Bitcoin for merely typing in a captcha, however it can take months to earn even pennies.
There are signature campaigns which require little work, just posting like what you're doing can earn you fair amounts of BTC for the work you do.
You can offer services for Bitcoin, which requires work (how much depends on the service you're providing), but can pay out a large amount and rarely requires software beyond what you have.
You can mine for Bitcoins -technically- for free, however you'll need to make an investment in order to make larger amounts of money.
There are plenty of ways you can earn Bitcoin for free, but the best paying ones require an investment of either time or money.
