“They don’t know who is speaking so they can’t trust it; they can’t tell if it is real or made up; they can’t tell if the source has an agenda or is even knowledgeable.”
Occupying the middle ground between Facebook’s real-name policy and 4chan’s posts without accounts, platforms like Reddit and Twitter are home to many pseudonymous accounts. The key quality, here, is that these accounts display persistent pseudonymity.
On the other hand, networks with profiles that allow for more anonymity often grow more easily at the beginning because of the lower commitment required. Long term, however, we’ve seen them burn out and produce less value on average.