Réponse:
1) No I wouldn't like to add this person as a friend
2) He said that he would find my address and come to my house and we don't know what intention he can have.
3) dangerous - bad
4)
You have to be careful about what you say on social media
you mustn't talk with unknown person.
you must take a step back from the information that you can see on internet
you shouldn't spend too much time on social media
voilà j'espère que ça t'auras aidé passe une bonne fin d'après-midi <3
