Hacking with SET (Social Engineering Toolkit) Security While Using It. Ques!

Hey Guys,

I am quite a noob in hacking and I am having some questions in my mind.

kali linux

Ques no.1 Is there need to change MAC address of the pc while using SET (Social Engineering Toolkit)

or other programs like sniffers, exploiters & bla bla bla........................

Ques no.2 Can i hack someone's facebook or gmail account who is far from me and not in my network

i mean we are not connected to same wifi or hotspot

Tips will also be highly appreciated. thanks