I'm sorry, I simply don't see how you expect to be able to share selectively without UI. And unless that sharing UI is embedded in every possible page, you're

I'm sorry, I simply don't see how you expect to be able to share selectively without UI. And unless that sharing UI is embedded in every possible page, you're kind of stuck with a popup. Unless it were a browser feature, I guess. Which doesn't make it not pop up, but makes the popup a little more trustworthy.