Please, help me to find grammar mistakes. Thank you!

1. What problems can virtual communication cause?
2. Does typing or texting let people express themselves well enough?
3. In what way does technology make social communication easier?
4. Can technology function as a substitute for real-life conversations in face-to-face situations?

To my native ears, #1, #3, and #4 sound, and seem grammatically okay to me. For #2 though, I would modify the sentence to read:

Does typing or texting enable people to express themselves well enough?

Although the words enable, allow, and let are synonyms, IMHO, both allow and enable (with the latter working best…) seem more appropriate than let in this construction.

As an aside, the first three questions are open-ended, and the answers can vary. However, the last one is close-ended as the answer is invariably, no, so there is not much that anyone can realistically write about it. I hope that this helps you. J. 

Please, help me to find grammar mistakes. Thank you!

1. What problems can virtual communication cause? What are the problems that can be attributed to virtual communication?
2. Does typing or texting let ALLOW people TO express themselves well enough?  
3. In what way does technology make social communication easier? Very good !
4. Can technology  function as a substitute for real-life conversations in face-to-face situations? It is a good sentence. You can also say:  Can technology BE USED as a substitute for real-life conversations in face-to-face situations? 

Congratulations !