"I've always found", you missed a word.
I'm genuinely surprised this is news, FB has been a notorious battery killer for as long as they've had an Android app. It's why my current LG G2 is the 1st Android device I haven't rooted, it doesn't have that crap built in so doesn't need heroic effort to tame it. Had to remove 14 separate APKs from system to kill all the FB,Twitter and other crap on my last (ever) Sony phone.
They regularly throw in a placebo 'fix' for it, only very occasionally does it improve till the next update. I suppose relatively few noticed it because so many phones ship with this shit deeply embedded, where it can't be removed and in earlier Androids couldn't be disabled - easy to spot a new install hammered battery, not so when it's always been there.
Twitter has been pretty bad at times but they seem to have got better at making it behave itself, concentrating on breaking the apps functions instead ;)