FYI all you Facebook marketers: Facebook recently announced that it’s making some changes that may negatively impact your Facebook Likes count.

What’s going on? Facebook is doing some long needed clean-up of accounts, subtracting any that have been manually deactivated or accounts owned by people who have passed away (sorry, but it’s true. They call it ‘memorialized’).

They’re not saying how many of the 1,000,000,000+ accounts will be subtracted, but they did say they are going to do it over the next several weeks. Meaning: It’s coming, and it could be 2 weeks or 10 weeks, maybe even more if they throttle it.

Of note is the ‘manually’ deactivated part. This means only people that went in and chose to deactivate their Facebook account will be subtracted. Folks that just aren’t active, like not logging into their account for months, if not years, will not be subtracted. But who knows, after this first clean-up, they may consider this as well. They are really into ‘active’ users, and claim almost 1.4 billion monthly actives as of January 2015.

So consider this a heads-up. Hopefully your ‘Likes’ growth will more than offset this impact, but keep a close eye on it, and consider it as you gauge and report on your Facebook metrics!