In German there's a term called Eierlegende wollmilchsau. A wool pig that gives milk and lays eggs.

A reason that term exists is because there's a tendency for Germans to wait to commit to, or outright dismiss choices because they do not meet ALL of a list of requirements.

I bring it up because I do not believe that it is possible to have an identity and anonymity concurrently while the service achieves all of its goals.

Either the service caters to anonymity, or it caters to identity. Trying to sit on the fence too long results in more specialized services dividing the customer base.

i don't disagree. but what's more important? personally i'd vote on people being able to be heard. however, those messages are diluted or hidden if massive amounts of bots are spamming something else

Anonymity and bots are an interesting problem. As users become more anonymous, by creating interest-specific accounts, changing their posting behavior, and use proxies, they converge on the behavior of bots trying to masquerade as humans.

Total anonymity means total freedom of speech and total lack of trust in speech.

Facebook needs to find it's balance between anonymity that increases activity while eliminating trust, and strong trusted identities that limit activity based on social pressures.