The only "avoidance" of taxes happening here is during the initial transaction of transferring the Facebook shares to the LLC's ownership. Of course as the LLC sells shares that have gained value, the capital gain would be taxed, as would any dividends or growth from any other investments the LLC makes.
An estate would not be taxed on the value of the LLC, the same way one he is not taxed on the value of his stock. It is taxed when sold. If he assigns family members as owners there would not be additional taxes when he passes away if the LLC's money continues to grow.
>11. Limited Liability Company (LLC) and Family Limited Partnership (FLP) FLPs and LLCs let you reduce estate taxes by transferring assets like a family business, farm, real estate or stocks to your children now, and still keep some control. They can also protect the assets from future lawsuits and creditors.
>Here's how they work. You and your spouse can set up an LLC or FLP and transfer assets to it. In exchange, you receive ownership interests. Though you have a fiduciary obligation to other owners, you control the LLC (as manager) or FLP (as general partner). You can give ownership interests to your children, which removes value from your taxable estate. These interests cannot be sold or transferred without your approval, and because there is no market for these interests, their value is often discounted. This lets you transfer the underlying assets to your children at a reduced value, without losing control.
Family LLCs can work for reducing the estate tax if you transfer ownership interests during your lifetime at a reduced valuation, owing to the fact that the membership interests are not marketable, giving them a lower value than the market value of whatever the LLC holds.
The only way you avoid the estate tax is if you transfer an asset to an irrevocable trust or your family members before the asset gains significant value. If you own, directly or indirectly, an asset that has significant value, it is taxed at death.
This LLC is not an effective way to avoid estate taxes on the vast majority of his wealth.