I don't know if it's normal or not.

I wouldn't feel comfortable with it.

It's possible that in your situation his behavior reflects the way he wants people to see him, or the way he wishes things were, or the way he wants to see himself.

But still, if he's posting presenting his relationship as something other than what it actually is then I'd be concerned. Of course if you confront him about not seeing his son, he might ask to set up a visit. So you might want to know ahead of time how you want to handle that.

Best wishes.

That's the thing he won't visit he hasn't seen his son in over a year not even text and ask how he's doing. I think it really weird that he's posting pictures of him and his son and he hasn't even seen him. And I can't confront him. I don't know what to say to him. I'm still really hurt about what's all happened between us. But if he hasn't seen his son in over a year he shouldn't be posting pictures together acting like he's a good father.

I can relate to that but why is your mom sending him pics if he is not involved with his son? Your mom should ask you first if sending him pics was ok. I do not post pics on fb because of that. My sons dad would take the pics and pretend father of the year. So, now he cannot post anything bc he has no pics. Your mom should not have given him the pics without your permission.

I understand and I talked to her about that but even old pictures he's had he's posting them on Facebook like he's still involved. I don't want to talk badly about my mom. She's being nice maybe too nice even. I can't just text or call him and say please do not post pics of our son on Facebook. And even his snapchat is our sons name. He's pretending that he's the father of the year and even his mom said he has pics on his wall of our son....wow that's great that deserve an award. Where has he been? He was there for the first year and even then I was doing most of the work. He hasn't contacted me since April 19 2016. Maybe if I see him again I can talk to him about posting the pics. I don't post pics on Facebook for that reason too. After everything that's happened I'm scared to.

Probably just misses him

I don't know him, so of course these are just guesses, but there are any number of reasons why he might be doing that. Depending on your feelings about him, some of these might sting (sorry). I was married to an emotionally abusive nercissist for many years and at the end, he did similar things with pictures of our kids (who he barely ever talked to), and even with my dog! He was doing it for a couple of different reasons. I figured these out from his captions and the sites he was posting on. 1) because that's how he wanted to see himself and how he wanted others to see him, 2) to impress women he was targeting by making himself look like a responsible, loving single dad (what a joke!), 3) to alleviate his own guilt and loneliness after realizing that we were getting along just fine without him, and 4) yes, a little because he missed his kids (I've put this last because he only misses them when he has "nothing better" to do).
I don't know if your ex's reasons are as nefarious as these, but I agree with both Breyl367 and Singlemom76. That doesn't seem normal. If you feel uncomfortable don't ignore that because mom instincts are usually right. Be mindful that your child might like seeing his dad post pics of him but if he doesn't, then do something because your child doesn't deserve to be reduced to a tool for satisfying his dad's delusions. Also, yes, if I were you I'd talk to my mom and set some new boundaries. She needs to respect what you say is best for your child because you are raising him and with him every day.