Ipad keeps  coming on and  online, even though I have it shut off and  wifi shut off, why is this and how can I stop it?  After shutting it off,  sometimes   10 minutes,  or hours later it comes back on, even when not using it

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When my Ipad has been disconnected from wifi and  shut off, it keeps  coming back on and online.  It can happen in 10 minutes, or hours later,  happens  irregulary.  Have noticed when it happens, I get nofications  from facebook of  comments and or posts..  I can switch the wifi off,    switch the iPad off and  then set it beside me,  hour later it dings, i have  noficiations of  face book things, and its online again.. why is this and how can I stop it from happening?
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Replay

Yes, I went to settings and turned wifi off.  Thought at first I wasnt letting it set for a sec or two before shutting the iPad off.  so now I wait like a minute or two  before shutting the iPad down.  didnt  seem to help.  Tried  actually logging out of  facebook when I was  done with it,  worked for about  4 days, and now it has started  coming on and coming online again,,  I  went through my notifications and  shut things off,   Well  see if it works.  thank you.