DH has an account and i just use his. i use it for VF Roost too - with the little footnote that describes who i am on VF so that people will be able to find me.
if you don't have that option, an inactive person on FB won't have all of the annoying pop-ups, feeds, etc. just don't friend anybody, or let anyone know you have an account. if they find you, you don't have to friend them. even better, you can put "ignore" on their initial request!
we have a couple of friends who are like this - one of them is a physician, and he uses it just for personal reasons, but even then, he barely has any posts. because he's rarely on there, there's no pictures, no posts, no likes, etc. it doesn't even have any affiliations except where he attended college so that people don't confuse him with anyone else with the same name.
therefore, if you're inactive, you will have way, way fewer ads, traffic, posts, etc. if you're active on FB, you will get the same proportion of ads and pop-ups automatically from anyone who might be aware that you have a presence on FB. so if you're looking at a particular product's website, they might track you by the very fact that you accessed their FB page. but you can block anything that comes by from popping up on your page.
on topic: you can join VF Roost and also have access to coupon deals that video instructors post on their page. this proved to be fruitful - i joined Ellen Barrett's private group and got her discount on her recent set. DH asked "who is Ellen Barrett?" it was worth it for the discount!
you can post a picture of your cat as your FB picture.
you can turn off email notifications as well - those get to be very annoying and congest your email.