I don't disbelieve your assertion that you personally would find it annoying, but I know a good number of large, successful blogging brands do indeed push to social media multiple times a day, and it seems to work for them. Several of said brands have indeed published articles suggesting that publishing multiple times a day serves to boost, not diminish, your popularity.
In addition, some counter-anecdata: I don't really use Facebook, but I've certainly not found myself put off by those blogs I follow which post that often to Twitter, for example. Indeed, I think I'd find it more annoying if they reduced their posting frequency - I'm not on Twitter 24/7, and if they only linked to their posts in a single digest-style tweet, I'd probably miss it.