Is it ok that I found my daughter’s adoptive family on Facebook and look at it sometimes?

I am a birthmom in a semi-closed adoption. By an accident early on in my relationship with her a-parents I discovered their last name which was supposed to be a secret. Recently, maybe 8 months ago I discovered their profiles on Facebook. I havent heard anything from them for about a year and that is part of our setup. I would never add them as friends, doesnt seem appropriate somehow. Also if they didnt accept me on FB I dont think I could handle it! So instead I sometimes look at their profiles. The profiles are blocked, all pictures & posts set to private so I am not snooping per say. I just like knowing they are there. Is that crazy? Am I stalking them? I love them, I am grateful every day that they are giving my daughter a quality of life she deserves. I feel kinda creepy for typing in their names just to look at their 1 available profile pic but it comforts me. Has anyone else done something like this? All viewpoints welcomed but please be gentle!