大変よくできています。合格です。
I agree with sending messages on the Internet.
Firstly, from the perspective of convenience, it is absolutely crucial to send (X posts→messages). This is because it leads to solutions for problems such as misunderstandings caused by (X upset→upset feelings).
Secondly, it is actually beneficial for (X catching→reaching) people.
From the perspective of time, (X to be specific→specifically), it means that the effect of (X best→optional) timing can be anticipated, leading to an improvement in time (X loss→efficiency).
Therefore, I think that we (X have to→should) send messages on the Internet.