Comment 6 for bug 841835

@john, I see three issues with the proposed design : currently, lenses using web services don't query them when displaying results in the Home dash, and only allow them on lens view, for good reasons.

If every sources become activated by default, each single search in the Home Dash will trigger http calls, which is :
1) bandwith expensive
2) not nice for the content providers who will see their service hammered each time the Home Dash is searched and for the developers who have a limited number of API calls per day on some web services. We don't want services to block the IP adress of Ubuntu users.
3) bad for privacy, as searching for a private local document, will send this query to every web services.