Indeed Israel does it, but only for Arabic or Muslim tourists that present certain characteristics - political engagement for instance. So it does exist but it's really not mainstream
Arabic is a language and speaking it is absolutely no guarantee that you are a muslim. Lots of non-muslims speak Arabic both inside and outside Israel, including a significant number of Israeli Jews who routinely engage in good mannered and friendly commerce and friendship with fellow Israeli citizens who are Muslim or Druze or Bedouin. Being bi-lingual Arabic & Hebrew is quite common in Israel. I visited a school in Tel Aviv where Muslim and Jewish children were taught together in Arabic and Hebrew; they were all fluently bi-lingual and completely integrated. They are part of a long term plan for the future Israel by removing barriers and segregation and building an integrated country together.
Having visited Israel multiple times, I know for a fact that speaking Arabic does not get you refused entry nor does it single you out for prejudiced treatment.
However, a track record of making anti-Israel statements - not the language you speak nor your religion - will get you questioned and may lead to refused entry. Most people refused entry this way are not Muslim, they are white westerners from left-leaning Christian or secular groups who are active in BDS. That's exactly the same as a track record of making anti-America statements will get you questioned at US borders and quite probably refused entry (see other comments in this thread for examples of that). Israel are doing nothing different from what America or Canada or the UK or Turkey or Saudi Arabia or any other country does.
I see what you did there. You're suggesting a moral high ground by insinuating you are against prejudice but are really being prejudiced against Israel for doing something that every country does. I just don't know if its through ignorance or if it's an intentional slur.
Do they not see the irony, in a nation of people that used to got the short end of discrimination and thought policing, now doing it themselves?
Edit: before I get downvoted into oblivion, and I'm sure I might, I'd like to add that reality is almost always uglier than anyone - especially me - would like it to be.
But that still doesn't justify that kind of surveillance. And if one claims that a piece of land belongs to them and refuses to let it go independent, but also refuses to recognize the people living there as citizen, then one has to expect an uprising.
Terror attacks are a barbaric way for the palestinians to protest, but protest itself is justified.
The social media check cannot be automated.
Border police at other countries also check online to follow up on the stories of a people who they stop as potentially not admissible.
But it will be.