[Theodores]

> It seems to me that the overall interest in Facebook is decreasing

Google Trends never lies. Some say that people have learned they don't have to search for Facebook, but the trend for Facebook follows the 'myspace curve of disengagement':

https://trends.google.com/trends/explore?date=all&geo=GB&q=f...

Note that people never type 'whatsapp' into a browser.

I think that social media is always going to be fickle. Google and search is a much better bet for the product being relevant in years to come.

Facebook is also a black hole. It is very rare that something written on Facebook is noteworthy enough to be shared outside of Facebook, here for instance.