Personally, If ever I will be able to start earning bitcoins, I do not know where to invest it. My current plan is just to earn some every week by joining signature campaigns, convert it immediately into fiat, and use it to buy some stuff that I want. I am still a college student anyway, so it is more like an online job for me. But I am hopeful that someday I will have more knowledge about bitcoin so that I will be able to invest too.