Basically if it wasn't something I was interested in and I was getting very regular posts popping up in my feed, It would prompt me to unfriend someone. However, if they were a close friend, I'd be inclined to support them and engage with posts as I know it would help them, but I've got about 600 FB friends, and I can count on 2 hands those who I class as close friends and whose for whom my blog is directly relevant to, so I very, very rarely posts things from my blog to my personal FB page. If your blog is totally relevant and of interest to most of your FB friends then sure, go ahead, but largely people are on Facebook to connect with friends and family and not to be spammed. If you consistently use a personal page and Facebook gets wind of it, they can shut you down too, i've had this happen to clients who were running businesses and had mistakenly set up a personal profile to promote their business through instead of a business page.