Have a look on the below python script to take snap of FB homepage by using selenium package of Chrome web driver.
Script:
import seleniumfrom selenium import webdriverimport timefrom time import sleepchrome_browser = webdriver.Chrome()chrome_browser.get('https://www.facebook.com/') # Enter to FB login pagesleep(5)chrome_browser.save_screenshot('C:/Users/user/Desktop/demo.png') # To take FB homepage snapchrome_browser.close() # To Close the driver connectionchrome_browser.quit() # To Close the browser