If anything the skew within the platforms is to prioritize pro-palestinian views https://twitter.com/committeeonccp/status/173279243496103143...
It also seems like these platforms create (rather than support) anti-Israeli views: https://twitter.com/antgoldbloom/status/1730255552738201854
US views skew pro-israel, and GenZ is closer to 50/50, so if there's something going on online, it's not in favor of Israel.
It's probably relevant that there are 1 billion Muslims to 16 million Jews, and that the largest relevant population of pro-Israeli internationals is India and Indian Hindus, and they are not on TikTok (blocked in India).
But conflating anti-Israeli views with anti-Semitic views does a disservice to Jews and Palestinians alike.
But chants like "from the river to the sea" (meaning destroying Jewish country) and calls for an intifada (de facto violence against Jews) are anti-semitic. Supporting Hamas, whose goal is to kill as many Jews as possible, or saying Israel shouldn't defend itself against Hamas attacks is anti-semitic (Hamas is also bad for Gazans, but that's another story). I can go on and on. People holding these views may hold them not because they hate Jews (for example, I don't think that people removing posters of kidnapped Israelis necessarily hate them), but the result is all the same. There is also obvious anti-semitism unrelated to Israel, like attacking synagogues, drawing stars of David on Jewish houses, etc., but that's not what I'm talking about.
And the most vocal anti-Israelis are naturally the most extreme ones and usually include some of the stuff I mentioned. As a result, people call out anti-semitism, usually not referring to anti-Israeli critics you are talking about.
When I hear that chant I don't assume that it means 'destroying Jewish country' but rather that the Palestinian nation (i.e. people) should be free between the Jordan and Mediterranean. There is no contradiction in the hypothetical chant "Palestine and Israel shall be free from the river to the sea" if we are talking about nations and not states.
The problem is that neither Israelis nor Palestinians can be free in a state that practices apartheid against them (be that an Israeli or Palestinian state). So you could interpret "Palestine shall be free from the river to the sea" as a call to end apartheid in Israel. Which brings us to the crux of this issue - Israel's determination to remain an ethno-religious apartheid state. The founding of a state where only a certain type of person can be a full citizen is the original sin here in my opinion.