Whereas I do consider http://ramamia.com a startup, and http://tickrtalk.com a startup (funded and in dev), and http://classleaf.com a startup.
I can change that to 8 if Avecora (which did previous web stuff, but now is developing a mobile dev) doesn't count as one, since it's in development. In fact. I'll list them and try to qualify them, chronologically sorted.
DebateWare - sold enterprise event mgmt software. sponsoring debate event in bos in oct
Avecora - doing a mobile device in dev
Avecora OnDemand - CRM/Project Management app. only connected to Avecora by name. market sucked.
Cadmium - social advertising network. used facebook data to target ads. decent revenue, closed down later b/c market was :/.
Student Concourse - was at WebInno 22. Lots of users but bad retention rate. Closed down.
FB Idol: >15,000 Facebook users and very active. monetized via ads, with good money. said screw it and sold it.
Ramamia: with hnuser:jasonlbaptiste. few thousand users, in public beta. tons of gigs of photos. launching next month.
TickrTalk: in dev. funded by UPenn Weiss Tech Fund.
Classleaf: sales force started making calls last week. software. it's selling.
Adaptance: in dev: advanced ad network built on a complex algorithm combining behavioral + contextual + 3 other targeting metrics.
I don't really know what the definition of a startup is, but I know it's certainly different than a website. HN in general tends to have a very liberal definition of the word. Side projects that never made a dime or had more than a few hundreds visitors are rightly or wrongly considered startups rather frequently. The word "startup" is so overused that like the terms "breaking news" and "celebrity" it doesn't really mean much anymore.
Website -> Startup
News -> Breaking News
Reality TV Appearance -> Celebrity