Apple is the easiest one for me. They aren’t going anywhere, although growth is slowing as they are close to saturating the high end of the mobile phone market. It will be a value stock at $120/share. If it gets there, load up on it.
Facebook is harder. They own some incredible assets like Instagram but the outlook there is cloudier given likely regulation and it won’t be a value stock for another $100 of losses.
Assuming this is another WB style investor, he is waiting for 30% margin of safety to buy. Hence,
intrinsic value of AAPL = 1.3 * 120 = $156, FB = 1.3 * 30 = $39