Amazon & Bezos, as one example, has failed at several very prominent efforts over the years, from competing with eBay in auctions, to competing with Google in traditional search, to the Amazon phone.
Companies should not succeed at every venture. Not only is it impossible, it's undesirable for them to succeed like that. By that standard there has never been a successful company, because nobody has managed to own everything yet.
The measure is overall value creation by the business for shareholders. Facebook is one of the greatest success stories in world business history by any reasonable measure of value creation, both in regards to its profit levels and balance sheet value increases. And they've done that in a shorter amount of time than any other company before them, with perhaps only Google a close second.
FB net tangible assets have increased from $41 billion to ~$58 billion in the last year, that's twice the net tangible assets of Microsoft. Not only does Facebook have a healthier balance sheet than Microsoft, they're going to catch them on quarterly profits within about ~18 months. Microsoft is 42 years old, Facebook is 15 years old. Facebook's net tangible assets match that of Walmart.
Here's what the balance sheets of other blue chips look like:
Coca Cola: zero net tangible assets
McDonald's: negative $5.6 billion
Oracle: negative $1.5 billion
Netflix: negative $6.7 billion
Starbucks: positive $831k
Comcast: negative $46 billion
Boeing: negative $7.7 billion
GE: negative $40 billion
AT&T: negative $78 billion
Verizon: negative $84 billion
Procter & Gamble: negative $15 billion
IBM: negative $22 billion
Pfizer: negative $33 billion
Johnson & Johnson: negative $25 billion
Lockheed: negative $15 billion
Home Depot: negative $821k
3M: negative $1.8 billion
Delta Airlines: negative $731k
UPS: negative $4.8 billion
PepsiCo: negative $17 billion
Walgreens: negative $590k
Additionally, without knowing what is listed as a tangible asset there is very little way to compare them to businesses in completely different markets/industries.
Other than that, many of his initiatives are nearly complete failures: Internet.org, Facebook drone internet, Oculus, Portal, Facebook Phone, the developer program, the cloning of Snapchat, his own national press tour, etc.
Not to mention, he's had numerous serious public-facing, brand-devaluing flubs that are literally too innumerable to list here.
For some reason, he doesn't surround himself with the best people anymore. I think because he's surrounded by an army of comms/PR people rather than actual scientists and engineers at this point.