Grammar Pro Tip

If you're not sure whether you can use a company's name as a synecdoche for an account you have with that company, substitute in "Bank of America" and see if it still makes sense.

Examples:

Help, someone hacked into my Facebook!
Help, someone hacked into my Bank of America

All my friends have Tumblrs.
All my friends have Banks of America [or Bank of Americas]. 

My mom still doesn't have a Twitter.
My mom still doesn't have a Bank of America