Mobile Friendliness 91% of adults have their phones within arm’s reach 24/7
A slow page speed and visitors will abandon your site, reducing conversions & sales.
The best way to influence this metric is to improve your overall SEO. In particluar, by getting more links from other well linked-to pages.
Well done! facebook.com is doing pretty well. Go ahead and give yourself a pat on the back. There's no rest for a marketer though. Isn’t it time you took your web presence from good to great?