Most popular domains: .net bigger than .com
ftp.isc.org
ftp.isc.org
E.g. http://www.domaintools.com/internet-statistics/ gives different values: 13,100,186 registered .net domains and 87,707,437 .com domains.
In any case, I think .com clearly outweighs .net in terms of registered domains. Hostnames don't really matter anything.
I really wish all the current .net registrations could be shunted into the .com namespace, and then .net redefined to mean social networks. That is, every .net domain would be expected to have a public Diaspora/other social-networking-mesh-server running, in the same way that every .com is expected to have a public web server running.
There wouldn't be a binding any more than TLDs today are bound to the web—the .net TLD would just mean "owned by a social network", just like .name means "owned by by a single person/family" or .org means "owned by an organization." All services that collected users for the explicit purpose of letting them communicate with external services and/or one another—Facebook, Gmail (or rather, Google Accounts), Twitter, Reddit and HN, any forum, Battle.net, etc.—would qualify as .net domains. The fact that they're currently web-based (or custom-protocol based) social networks makes no technical difference.
(And alternatively, services like Google Wave and Buzz wouldn't really be separate .net domains—since they're not separate social networks, but rather subsets of the Google network that have a flag in their accounts flipped. The clients for them could live on the website at "google.net", but the services themselves would no longer give you separate, secondary identities.)
It's just that, once something like Diaspora got going, social networks would become a distinct kind of site—they'd be the only kind that would bother running Diaspora servers at all (why run one for your company/organization? Everyone's already going to have an externally-bound identity anyway.) So, being able to guess that something is a social network/is running a Diaspora server by seeing the TLD (like grandma is able to guess that something is a website because it ends in .com: a "type it in and see" kind of guess, not one you place bets on) would be a nice convenience.
I don't know where these numbers come from (original article) but they are wrong or I've misunderstood their meaning.
For some reason -- perhaps just traditions -- it's especially common for bulk service providers to assign individual machine/address subdomains from .NET rather than .COM.
Indeed: I'm using a Comcast cable modem, and you reach Comcast's web page at comcast.com -- but my dynamic IP reverse-resolves to a comcast.net subdomain, and is obviously one of many thousands from its formulaic construction (including within it the IP address and region hints).