Nic Brisbourne just wrote an incredible post on what can make an internet startup successful.
It was inspired by a presentation from Jyri Engestorm founder of Jaiku (I should try it now that i get the twitter thing). I've enclosed the presentation because it says a lot by itself :
Nic make a very good point about "essence"
how the service will operate as an emergent system - liquidity, status, buzz or UGC are common forms of “essence”
It reminds me of a phrase I found : "Forget selling features. Sell status, sell luxury, sell solutions, sell hope, sell inspiration" Know i am even eager to say ... sell identity ! Bourdieu would say Symbolic Kapital ;-)
The second point he made was about "social objects":
Think photos on Flickr, bookmarks on Delicious, or music on Last.fm and you start to get the picture.
Nic is right it's not an obligation (Myspace is an exception because they were the 1st and at that time "social objects" where picture and comments), but it made me think about facebook and i think the all idea of Apps is to give more social objects to create stickiness. It's only the beginning of my thoughts but I will digg because I have and will continue to dig Nic's trails.