Am I extremely wrong, or are facebook question weirdly ignored?
https://stackoverflow.com/questions/tagged/facebook-javascript-sdk?sort=newest&pageSize=30
Barely a single upvote for any question for weeks..... and the only questions that are having any attention are those which tagged as javascript before the facebook
Any reason?
I answer this question as someone who has spent more than a few hours cleaning up facebook related questions...
The reason for so few upvotes on facebook tagged questions is because most facebook questions are quite crappy. Not only are the authors usually absolute beginners at using facebook APIs and possibly even coding, they are usually also beginners at StackOverflow - that usually shows in the quality of their questions.
The "facebook problem" has been discussed a few times in the past because there were avalanches of bad questions coming in. It's got a little better over the last year or so, but I use the word "better" in a generous way - it's probably best described as less bad. The reason for the mess in the first place was an influx of inexperienced users. The lack of facebook representatives answering questions may have contributed - the questions would still have been bad, but at least they would have been answered.
Is it something the community can do something about? Yes and no. You can't stop the bad questions coming in, and down voting them simply makes the user (who was frequently transient anyway) disappear again, leaving their question unanswered and tumbling in the wind, waiting to be garbage collected. The community can help by tidying up those questions, so they may attract at least some answers. Gradually the tag will build up a population of experienced users who will eventually start to give back by answering questions instead of just asking them - when that happens the tag will start to slowly snowball and become more like the other mainstream tags.
Note that I'm not saying all facebook questions are bad - just a disproportionate amount of them. It's very slowly getting better - good things can take time.
You cannot predict or control how the community will react to you post.
That being said, you can be more specific than only Facebook if you want your post to stand out in the feed. I mean, Like Jeroen pointed out, 2.8K followers is nothing on SO so nobody will see it pass by if you only tag it Facebook.
Also, there are a lot of succesful facebook posts out there so I don't think the tag itself is a problem.
facebooktag has 2.8k followers, that's very little (and it's the most of all facebook-related tags). If you don't include a major language, chances are barely anyone will see your post.