What these unrelated services did doesn't refute the point that a small team can put together a blogging service. Most components you need even already exist as

What these unrelated services did doesn't refute the point that a small team can put together a blogging service. Most components you need even already exist as pre-packaged FOSS. On top of it, one company on your list had a complex product that was built by a hand-full of college students in its early days. The Instagram company they bought also had just 13 employees.