Go to web site vs Go onto web site (Which one is correct?)
I would like to know how I should say when I am talking about VISITING a web site, "go to web site" or "go onto web site."
Examples:
1. I have to go TO/ONTO Facebook.
2. I have to go TO/ONTO Gmail.
3. I have to go TO/ONTO Google.
4. I have to go TO/ONTO LinkedIn.
Also, when I am talking about mobile apps such as Whatsapp, Telegram, etc. How should I say?
5. I have to go TO/ONTO Whatsapp.
6. I have to go TO/ONTO Telegram.
One last question, when I am talking with someone via messages on a web site or a mobile app, how should I say in the following context?
7. You can send me the document HERE/ON HERE, not by email.
8. You can tell me about your problem HERE/ ON HERE. it is not necessary for you to call me.