I'd focus on ways(social) that don't require investment. I learned more about BTC not having any to invest than when I had a few of them.
plenty of ad networks on this forum that will pay btc.
Those ad networks are called Signature Campaigns, where you wear a signature of the website they provide and upon posting wearing that signature you get paid by them for advertising their service in your signature space, and yes, it is actually a quite stable way of earning a few bitcoins with the time.