I'm actually more likely to post my slash to Teaspoon than on LJ, as I have a few very good friends who aren't really comfortable with slash, and while I respect their ability to scroll past, I just ... feel better not putting it in front of them.

Um ... speaking as a Teaspoon mod, the slash I see is usually one of the big established pairings -- Doctor/Master, Doctor/Jack and Jack/Ianto. Everything else sort of bubbles under, and femmeslash is relatively rare.

I suspect, and others may thwap me if this is inaccurate, that the great rise of slash culture in fandom, and the concurrent emphasis on non-canon pairings, coincided approximately with the rise of LJ as the primary base for fannish activity. In all of my fandoms, those sorts of fics just don't get posted to major archives with the same frequency. Sometimes authors seem to equate all archives with FF.net; others just prefer to have more control over where their fic is, what the pages look like and who can read it. I don't know.

Teaspoon also has a greater proportion of male authors than a lot of fanfic archives. This might lead people to think slash is less welcome? I'm not sure, but I'd be curious to know.