Some observations of 'successful' facebookers ever since I joined FB 7-8 years ago.
1. Upload pictures of what you eat.
2. Upload pictures of sportsmen/teams you idolize/root for.
3. Be attractive.
4. Be a cute girl who takes at least 1 selfie everyday. Duck face = perfect icing on the cake.
5. Adopt a cat/pet.
6. Look up a website with some inspirational quotes. No matter what ideologies/philosophies you follow, if you posted some awesome quotes, you'll get a tonne of likes.
7. Add as many people as you can. There's a huge contingent of people who add/accept friends as they're addicted to FB. This, in turn, will allow you to garner more likes no matter what you post. Essentially, your probablity of getting likes will significantly increase if you added people.
8. Get married and have kids ASAP. Follow it up w/ a gazillion pics of 'em in action. Whether they're pooping, peeing, eating, crying, laughing, it really doesn't matter. People love kids no matter what.
9. If you're a girl, just take pictures and upload 'em. Doesn't matter what/how.
10. Go buy a DSLR. Your skills as a photographer are irrelevant. If you have a DSLR, you now have a credibility to walk around as a professional photographer. That's the trend among Nepalese these days, isn't it? Go climb a tree and take a picture of your surroundings.
Before I forget, after you get a number of likes over a certain number of days, if you're not satisfied w/ the number of likes, bump it up by posting a thank you note. A picture of this girl's selfie appeared on my homepage yesterday. She was thanking over 100 people liking and commenting on her pics 4 weeks ago! Now that it reappeared on her friend's homepage, it was definitely likely to spur those who missed out on liking it to do so!
P.S. If my mantras didn't work, consider changing sex, maybe? Cute girls get more likes than dudes.