There is no such option to view that. Privacy is Gmail does not provide that. You cannot look who filtered you and when.
If you know their log in details.
GMail is an e-mail service provider and not a social networking site. You cannot search for people using GMail. You can communicate with someone on GMail only if you already know their e-mail address.
Hacking any account is not legal according to Gmail. If you know the password, you can open it. Forcing someone else's account is a crime.
No
ask him ye you cannot find out unless he or someone he knows tells you.
You can get a call phone in Gmail if someone calls you. Gmail calling is not free but chargeable. It can be done to anyone in your contacts.
Yes, Gmail has instant messaging, aka, Google Chat. You can only IM with someone who is on your contacts, and has Gmail.
yes
No if someone just visits your gmail profile they will not be able to see all of your individual emails.
When someone signs out from Gmail, their mail is not accessible. It is done to protect the private files. After signing out, you again need the credentials.
Yes because the account is no longer existing.
Facebook's passwords are not accessible via Gmail. Gmail does not store passwords anywhere. The most it does is receive notifications.