Ok i'll keep it brief but basically I have a LIKE campaign running on a UK demo.....
Yesterday I ran half of the day on really small budgets for each adset and was hitting 60% - 100%+ CTR's (Yes seems a bit far fetched but i was paying sub 1c per like)
So I let it continue running through the night (New day midnight GMT) woke up this morning and the CTR's are in the range of 1%-4%. So I paused to do some more testing.
I launched exactly the same adsets again in fresh campaign, CTR's 10% - 20%
I really am baffled to how Facebook can optimize and award those placements and CTR's yesterday but today it's completely the reverse.
Any ideas folks?
P.S - I didn't change anything with the campaign at midnight, kept same budget and oCPM for likes.
it's quite common to launch campaigns mid day and get absurd CTRs - once the clock strikes 12 and its then got a whole day to spend it's budget it tends to straighten itself out.
One other question though, what are you hoping to achieve with the LIKES as organic reach with pages is now pretty much non-existent.
Makes no sense that mate because at the strike of midnight it exhausted the budget so it didn;t even give the adsets a chance over the 24 hrs. AND a difference of 12 hrs aint going to drop a CTR 99%!
That's for me to know and you to find out
haha (Sorry bud)
P.S - I've got 4 years experience on fb and I understand shit changes more than I change my grits but the algo is so backwards. I've launched around 10 campaigns the same today and EVERY single 1 has been completely different, I mean from 1 end of the scale to the other throughout 
Well that's my point, it exhausted it's budget by midnight and it was only running part of the day. When it spreads the budget over the entire day placements will be totally different. Statistical significance comes in to play here as you can't judge the performance of an ad over such a short time span, you need to give it time to get a true reflection.
I wasn't trying to pry about your campaigns but everyone I know who was running big LIKES campaigns have now knocked it on the head as the likes themselves just aren't worth anything anymore unless you want to pay to advertise to them, which sort of defeats the point.
Noooo you are reading me wrong jone, The campaign started at midnight and exhausted budget in half an hr! It didn't spread it over 24 hrs
well it spent 90% of budget then shall we say.
When I set the campaign off midday it was good at spreading the budget over the remaining 12 hrs albeit only half of the budget set because that's how it plays.
Ahah no problem, yeah i'm still doing stuff bud or was should I say!
Hope that made more sense 
I think no one will give you an answer that you would like to here.
It was probably too good to be true. If you can't replicate it, it means you had just luck.
I was merely looking for people who had similar things happen that is all. I know how FB fluctuates so much but it's a rather large difference and all I can think is it bugged out and I happened to be placed in some unreal placement haha, weird and annoying at the same time.
Hey ho, still hitting large CTR's just not quite as large as that 