The thing is that Facebook is assuming that if you don't interact with a business page, fan page, etc. (commenting, 'liking' and so on), that you aren't interested in that page anymore. So, they're "Unliking" these pages for you. It started almost a month ago, and yes, it's just yet another thing that's eventually going to turn FB into the next MySpace. I haven't noticed much decline on my author page (yet), but the pages with tens of thousands of 'likes' + are starting to comment about these apparent mass exoduses. Hate it. Stupid, pointless, and does nothing to add to their revenue stream like the "Pay to Boost" crap they've pushed on us.