This has been true for quite a while, the stock price keeps going up but it can take quite a while for the break to actually come.
Also, I think what people heavily underestimate with FB and GOOGL is that the majority of their growth is coming from volume, which they are 100% in control of over the short-term.
All they need to do is add another ad to the page, and their revenue goes up. The problem is that, over the long-term, this results in less and less product. With the targeting changes, with the valuable US/young userbase shrinking rapidly (amongst young people, Facebook isn't even in the top five social networks), it is very clear that management are turning all the dials they can now but this can only end one way (I also suspect a lot of the "international growth" is not real).
Also, I think what people heavily underestimate with FB and GOOGL is that the majority of their growth is coming from volume, which they are 100% in control of over the short-term.
All they need to do is add another ad to the page, and their revenue goes up. The problem is that, over the long-term, this results in less and less product. With the targeting changes, with the valuable US/young userbase shrinking rapidly (amongst young people, Facebook isn't even in the top five social networks), it is very clear that management are turning all the dials they can now but this can only end one way (I also suspect a lot of the "international growth" is not real).