For a while now, the three-finger tap in OS X has been an easy way to look up the definition of a word. But in OS X 10.3.3 you can also use it to preview links in Apple’s apps.
Facebook recently added a new feature to its mobile apps in which it opens links in an in-app browser instead of your default. This is faster, but if you like the sharing options, bookmarks and anything else you’ve customised about your preferred browser, you can disable this behaviour.
Android: Instead of copy-pasting long URLs from your browser to a friend on Whatsapp, free app ShortPaste automatically shortens the link when you copy it. The service uses goo.gl or bit.ly to shorten the links as soon as you copy them.