I'm using Android 4.2.2 on my Q.mobile. I am trying to zoom a (or any) web page on Chrome by double tapping or by swiping two fingers but nothing happened. I also tried the same thing using the built-in browser but also in vain. How do I zoom web pages?
It depends on the website (or its mode) if zoom is supported.
Usually, you can't zoom if the site is on mobile mode. For Facebook, the URL would be https://m.facebook.com. However, some browsers like Dolphin or Boat have a setting to configure the default zoom, but sometimes they don't work. (e.g. Dolphin's setting doesn't work if Dolphin Jetpack is also installed)
On desktop mode, a site can be zoomable. For Facebook, the URL would be https://facebook.com.