Facebook no longer allows news feed posts to be added programmatically via API. But we can still post them programmatically... https://medium.com/@progrium/the-only-way-you-can-automate-facebook-posts-now-bd3a40fd1c4b

fbpost

#!/usr/bin/env node
// Usage:
// Login manually, saving your authenticated session in "data":
// $ ./fbpost --login
//
// Now you can post whatever you want via argument:
// $ ./fbpost "Hello world, this is a post!"
//
(async() => {
 const puppeteer = require('puppeteer');
 const arg = process.argv[2];
 const browser = await puppeteer.launch({
   headless: (arg !== "--login"),
   userDataDir: "data"
 });
 const page = (await browser.pages())[0];
 await page.goto('https://www.facebook.com');
 if (arg === "--login") {
   // wait for homepage to load after a manual login
   await page.waitFor('div[aria-label="Create a post"]', {"timeout": 180000});
 } else {
   // use keyboard shortcut to open and focus on create new post
   await page.keyboard.press('KeyP');
   // wait for emoji icon as proxy for "loaded and post ready"
   await page.waitFor('div[aria-label="Create a post"] a[aria-label="Insert an emoji"]')
   // keyboard shortcut put focus in place so we can just type
   await page.keyboard.type(arg);
   // click submit. TODO: wait for URLs to be expanded
   await page.click('div[aria-label="Create a post"] button[type=submit]');
   // can’t find reliable way to detect that it posted successfully,
   // but if we close too soon it won’t finish the post request
   await new Promise(res => setTimeout(res, 2000));
 }
 await browser.close();
})();

package.json

{
  "dependencies": {
    "puppeteer": "^1.5.0"
  }
}