Can a hacker see my video call with my friend or record it? Anybody else can see it?
Skype video calls are secure and you can be sure that the only people seeing the video stream are yourself and your partner and anyone else in the group call.
There are however cases where you might have downloaded malicious software to your computer that could intercept what you're seeing on your screen - If you believe someone is watching what you're doing, installing and keeping up-to-date an anti-virus program will help you get rid of any viruses; AVG provides a free service here: http://free.avg.com
I have only my one person on my contacts, I use it only with them, can their contacts see me or hackers see what I do ?
No, her contacts wouldn't be able to see you unless they were in a call with you(you would be able to see if they were in a call with you)
Hackers could only see what you do if you let them, to prevent that make sure you have up-to-date anti-virus software
Is it possible to hack my computer and "hijack" my cam so that the hacker can watch me ?
I cover my cam all the time but not when I use skype video chat.
I'm not sure about my anti-virus program, I hope I didn't make a mistake by using skype to chat with my friend. It was my first time, I didn't know much about it and about safety.
Yes I am paranoid, I checked my laptop after the call with a new anti-virus and it was clean.
Can you tell if someone hacked your computer before that ? Can the anti-virus scan tell if my computer was hacked 2 days before?
on the other hand, you can visit the link below for suggestions/instructions on how to disable or turn off Facebook Updates and/or Facebook Chat, remove Facebook contacts;