It's also somewhat dependent upon the goals of said notification. If it's someone coming in and promoting their own site/game, trying to leech some traffic off of me for their own gain, then it's an ad (or spam). If it's just something that was found to be cool and you wanted to point us all to it, then maybe it's fine. Pretty often, it's the former and not the latter -- which is annoying.
If this is your game, just ask me and I'll see if I want to add it to the site. I just don't like (and I've conditioned our players to feel the same) when people come in and spam.
If it's not your game and you're just helping our community, then welcome... and thanks. Just be clear of intentions and we're likely golden.