Everything which has a hinterland and ecosystem around it benefits from network effects. If you're going to throw up walls at the web-browser edge, sure, but...

Everything which has a hinterland and ecosystem around it benefits from network effects. If you're going to throw up walls at the web-browser edge, sure, but... Highrise, in particular, benefits from form processors, iPhone apps, analytics tools all outside of highrisehq.com. Nothing exists in isolation - everything in software services is a network-effects business. You can argue over how strong network effects are, but they're always present.