1. Use your keyword once in the first 100 words. Google puts more weight on the first 100-150 words of your page.
2. It is recommended that the article page should be more than 1,000 words, and the product page should be more than 500 words. And the content on each page is different.
3. Include your keyword in your URL, title tag, H1, H2, and H3 tag.
4. Make sure the title tag on each page is different.
5. The meta description should be short and on point, well described the theme of page content.
6. Optimize Images alt tags and filenames. Images should be under 150KB, you can use tinypng.com to compress.

Compared to Google, Facebook seems to be a bit unethical in the way it goes about to do business. Facebook seems to be using several tricky techniques to force people spend more and more on ads or paid promotion of their content.

1) Facebook is believed to made changes to algorithms that reduces organic reach of a post made on facebook page, apparently to force page owners to spend on ads. My page has 500+ fans, but most of the updates do not reach even 10% of them.

In below example, a  FB page post with a link to my blog got viewed by only 8 people over 15 days, while another post with just an image reached 418 people within 24 hours.(These were the min and max organic reach I got in recent time, other posts have got a number in between) My guess is, FB is suppressing the organic reach if you are trying to take users away from facebook, for reading a blog post or sign up etc.