Vine vanity URLs will have the form “vine.co/USERNAME.” After the land grab starts, users will need to login to their account on Vine.co; there will be a web page that will give you instructions on how to register your customized profile URL. That is, of course, if it is still available.
According to Twitter, it will be automatically reserve profile URLs that “mirror verified Twitter @usernames." So Bieber, et al, don't have to worry. For the rest of us, it's first come, first served, although even those with reserved URLs will have to claim the URLs.
In addition to an URL, users will also receive a Vine-specific profile page. This will provide followers an easy way to view someone's earlier six second videos.
Twitter's press release, sent to the media, is below:
Starting Monday, December 23rd, Vine users will be able to register a vanity URL for their Vine profile (e.g. vine.co/TwitterForNews). Verified Twitter accounts will be able to register profile URLs starting 9 AM PST, Friday, December 20.
Like your Twitter profile, a vanity URL offers the ability to share profile pages easily like you can with a Twitter profile (e.g.twitter.com/TwitterForNews). Vine profile URLs are optional and can only be registered by an existing Vine user.
The Vine team will automatically reserve profile URLs that mirror verified Twitter @usernames. Even though the Vine team will reserve profile usernames, you must still claim the profile URL by registering it.
If you would like a profile URL that is different from the handle of the verified Twitter account (for example, @RealSMG may want vine.co/SarahMichelle), this can be accommodated but you must register the URL, assuming the account is not already a verified account on Twitter. Once a profile URL is taken, it cannot be registered by someone else.
Twitter handles that are not verified will not be automatically reserved for Vine profile URLs. If you have an unverified URL that you would like to reserve, please send a list to firstname.lastname@example.org, and we can help reserve it.
To register, visit vine.co, login with your account, you’ll then be directed to the page below, where you can register your profile URL.