I would couple FB and Goog as advertising dependent.
I see others coming into compete with that model.
T's xandr is an example of other data harvesters from the telecoms and internet providers, who also have access to metadata. They'll eat away at the lead.
FB and Goog are at the top of their era. Social media and Goog may well be about to come under anti-trust and or censorship bureaucratic review, not to mention EU and other places taxation schemes.
Msft, Aapl, Amat, and Lrcx have business cycles along with a larger moat. A moat that has been cemented over the last brutal competition with in the semi business over the last 20 plus years.
It's always an interesting world when trying to find overvaluation.
You can be wrong for years and in 45 days brilliant (If you don't run out of money first) <smile>