Some good advice from my friend Kristen Lamb...and yeah, Kristen knows stuff...
Are You Alienating Fans on Facebook & Fracturing Your Platform?
http://warriorwriters.wordpress.com/2013/07/16/are-you-alienating-fans-on-facebook-fracturing-your-platform/
Btw, I don't read a lot of author blogs...really don't have the time...but, if you're looking for one to follow, Kristen would be a good choice...she's one of those people who has a clue what's going on when it comes to writing and publishing and stuff like that...