Răspuns:
1. Engage (in online conversations): Get involved, be connected to.
2. Highlight (a difference): Make stronger, stress.
3. Be concerned (about teenagers spending too much time online): Worry about, be distressed.
4. Quit (spending time on social networks): Stop, abandon.
5. Sign in (a social network): Enter your personal details into a website, so that you can use it.