This might not be exactly the right place for this question. However, I raised basically the same question some time ago on Facebook and in some Facebook forum and did not get any answer (kind of confirms my impression about Facebook and its users). I have a Facebook account that I visit infrequently, usually with a browser on my Mac, sometimes with the Facebook app on my iPad. Last night I did so from the iPad and learned through a post on my timeline that the husband of a very good friend of mine had a severe heart attack last week and will have open heart surgery today. Since my wife, who is currently out of state and does not have a Facebook account, had planned to visit our friend (and her husband) in about two weeks I thought it would be good to inform her about this by sending her a screen shot of the post about this event. However, when I looked at my Facebook account this morning with Chrome on my Mac I did not find this post in my timeline. I had to go to my friends own Facebook page to find it - something that I usually, of course, don't do as the "relevant" posts should also appear in my timeline. I noticed this before - the posts that I see in my timeline with a browser on my Mac are not identical with the posts that I see in my timeline with the Facebook app on my iPad. I tried to find a pattern and I couldn't. It seems that some posts that I see on the iPad are missing on the Mac but not vice versa. There is no difference whether I look into my Facebook account on the Mac with my usual browser extensions or without any browsers extension; there is also no difference whether I use Chrome or Safari or Firefox - some posts are simply missing when accessing my Facebook account with a browser on my Mac. Did anybody else notice this, too? Is there any known and intelligent reason for this?