It depends on your niche. If you are into photo blogging or similar, pinterest would be perfect. For blogging and web promotions, Facebook is a better platform. You try to test it and see which platform gives you more traffic.
Ultimately, if you see then both of them are very important for getting traffic. But, when it comes to having more chance to get traffic, obviously you can consider Facebook.
Hello, Both platforms are the best for the promotion but if you have e-commerce site I suggest you to promote on Pinterest and for others facebook is great.
In online advertisements, you can't ignore small social media platforms. Pinterest is a favorite among graphic design related business, photographers, Other content creators who shares their content based post link on pinterest too. My blog of recipes got most traffic from Intagram & Pinterest because user love to see great post title along with post. After that article quality must have great content so users can hooked upon. Digital marketers who left pinerest for bigger platforms, they difinetly missing important platforms.
it depends upon what is your product, whom do you want to target, what is your niche. Facebook is used by more than 75% people on internet it is a great deal to attract traffic on your site. while, pinterest is more for your ideas and thoughts on things. people reply more on facebook.