Sure! Here’s how you could fill in the blanks in the passage using the given words or collocations:

1. **digital tool**
2. **sign up**
3. **sign up**
4. **log in**
5. **instant messaging apps**
6. **facial recognition**
7. **face-to-face**

The completed passage would read as follows:

"Though it is easy to join a social network, means of protection would come in handy in case someone tries to hack your account and may access your personal information, messages or photos. Most phones now include (6) **facial recognition** function which prevents any stranger from unlocking your phone or accessing the app.

Social networks, no doubt, help connect many people together and they still do. However, some people think they are better at collecting friends than creating real friendships. Due to that reason, many people still prefer the traditional way, which is to meet people (7) **face-to-face** and directly interact with them."

Feel free to let me know if you need further assistance!