Attempts to Hack Facebook:

[Referee06]

For some time now, I have been getting e-mails from Facebook indicating that someone from Shanghai, China and someone in Mexico has accessed my Facebook account.  I frequently use Malwarebytes to scan my computer and 99.9% of the time, no malware is found.  However, when I am using Facebook, I frequently get notices from Malwarebytes informing me that attempts were made to access my Facebook account, but Malwarebytes blocked the attempts.  But, when I check my Facebook account activity, I see that someone from Shanghai and other places have accessed the account.  (I need to add that I use a VPN, but the server is in the US.)  Could someone or some people hacked my Facebook account or could the be able to hack my Facebook account at will?  And, what can I do about that if it is happening.  Thanks for any and all help.