None of them were technical. To the extent they contributed, it was either irrelevant to execution or simply a vaporware idea they had no ability to make happen (the twins).
Sure, if you're talking about a pre-seed stage startup with a single product 20 years ago. Meta/Facebook isn't that anymore, and hasn't been that for a very long time. Say what you want about Zuck, but the fact he more or less successfully has been running one the worlds largest tech companies of the century is pretty impressive.
What other products do they have other than those they acquired? 98% of their revenue is from advertising on Facebook and Instagram (according to their financial reports).