Yes. Without downvoting, I think you open Quora up to non-constructive answers which weaken the strength of the site. See What are good and bad reasons to downvote answers on Quora? That question has a number of answers that get at this point. That question and its answers also support the secondary point that Justin Bishop is making — which I agree with — that unfair/unreasonable downvoting is demoralizing.
We probably won't have a specific date that's a "launch" – instead we're going to gradually expand the beta and bring more and more people in as we open up. In January we're going to start the next phase of the expansion, which will mean that everyone can invite people they know and they'll be able to sign up immediately.
It's really hard to say since we're so early on and haven't launched yet, but I do think that mobile interfaces are really important (and are growing more so rapidly) and make a lot of sense for this kind of tool, and behind the iPhone, Blackberry is probably the next most important mobile platform.
We reintroduced endorsements recently (Reintroducing Endorsements by Abhinav Sharma on Quora Product Updates) with slight changes to the original model. It remains a public signal of trust in a person about a topic. This is how an endorsement works now:
- You can endorse a person about a topic they know about, in which case they get a notification about it, and your endorsement is added to their list of endorsers on that topic.
- If you endorse a person for a topic they have not yet added as something they know about, then they get a notification saying that they have been endorsed and asking them if they would like to add it as a topic they know about. If they accept that they know about the topic, then your endorsement is shown in their Knows About section.
If however, they say that they don't know about the topic, then the endorsement is not shown on their profile, and they are not notified or further endorsements about that topic.
We encourage endorsing people for demonstrated expertise on Quora or as a form of encouragement to write, on topics you know they're knowledgable about, even if they haven't actively contributed yet.
My understanding is that the Quora staff wants to carefully mold and develop the dominant cultural norms of the userbase. Technical scaling is much less of an issue than the social engineering part, where developing the right type of community and userbase is critical to the product being useful.
Sounds like a bug. You posted this question a while ago -> sorry for the slow response. I think this has been fixed, but if you are still having the problem, let me know by adding a comment below my answer here. Or send a message to email@example.com.
Unanswered questions stick around forever unless they are deleted. If you come across a question without an answer, you can follow that question (there's a "Follow Question" button at the top right of the question page). Following the question is effectively a vote that they would like an answer as well.
Perhaps this has changed since the question was asked, but anonymous edits do not contribute to your edit count. However, note that if you make an edit to a question and then go anonymous, the edits will not be subtracted from your count.
One easy way is to cite the question as a hotlink (using the at sign) in another answer, when and if that feels appropriate/helpful.
For both Gmail and Yahoo, Quora uses OAuth  to request authorization to access a user's email contacts. If you're not familiar with OAuth, what this means is that Quora never actually handles the user's password. Instead, the user is directed to either a Gmail- or Yahoo-hosted authorization webpage where the user logs in and grants access to a third-party application (in this case, Quora); the application then gets a short-lived, authorized request token with which to make API calls for the user's data. Both Gmail and Yahoo expire their OAuth request tokens after an hour. Using OAuth protects the user's password and also restricts third-party API access by Quora to only the users' contacts data.
Even for other email providers where the public OAuth standard is not supported, we value our users' privacy and security and do not save passwords.