I think marketing wise it's much better to post the 10 posts all over BTC.
I do like your mention of supporting the localised ann.. that would be good, but not to spam it, just to make it a bit more lively.
Exactly niklasmato. Most of users here are based here on this ANN page, because I don't know, they think if they post here, DO admins would prefer it and say: ''yes, this member is very active''. Ok, that is also some kind of activity and a great support to community, but soon this ANN will have more than 2000 pages, and it would be smart move to direct your activity to local threads and other part of forum. That would increase number of new supporters.
Also agree with the importance of activity in the local threads, not only on this forum, but also on the official DO forum. Apart from the globally focused advertising and spreading the word on various social networks, our local activities in our native languages can contribute to the success of DO as well. I have seen that some local threads are very active and I believe that the other will sooner or later follow. And if you do not find your local thread, you can have the honor to be the first active Onioner from your country and create such local thread