I'm working on a small project with my girlfriend, and it's a free service that we'll support with advertisements. (at least that's the plan)
I don't want to set the expectation that it's a wholly-operated free service, nor do I want to deter early adopters with ad-clutter.
If I'm not mistaken, I believe Digg, Linkedin, and Facebook grew their advertising footprint slowly and over time in respect to their community size.
Does anyone have an opinion on this?
Don't worry about ads and early adopters. Most of them have adblock or some variant turned on, the rest probably don't click on the ads anyway.