<p><pre><code>    critical mass
</code></pre>
As an example, I setup an NTP server a while back and found they used Bitcard.org as an authentication manager. I&#x27;ve been using it for years now and aside from the note on their website about running much of Perl.org, I&#x27;ve never heard of it being used anywhere else.<p>It&#x27;s probably a reasonable service but I&#x27;d never implement it on my website because I know I&#x27;d be telling customers to go off and setup a Bitcard account, which they would have never heard of.