Social Media Learning learning

I use Facebook and Instagram to learn English. I check out some memes or gag pictures there. I think they are funny and lighten my mood, and I can improve my English ability at the same time. I've learned many slangs and phrases on Facebook.
Recently I learned the phrases "hit the nail (right) on the head", which means :

1. Lit. to strike a nail precisely on the head with a hammer.

2. Fig. to do exactly the right thing; to do something in the most effective and efficient way.

I also make some friends on those websites, we chat in English, encourage each other. They make my life better.