I don't have twitter account, so i can't confirm that.. But pretty sure you can say there anything and unless Twitter (the company) provide logs, don't know if they could go through there.
Don't believe that was them just because would be too evident and they didn't even need to be so dummies.. For sure they knew the location of Kate&Molly + Hunter&Piper. And don't remember if they also visited dana&chris and the sub-managers. But i would say they knew all the houses and didn't need to burn the places that may lead to them.
To get to angelica&claus wasn't much needed .. Just some one from the country (even the investigation police) put their channel name (CB or MFC) at google.. Immediately appear the twitter and from there nothing else is needed... check who they follows or are following and there is a twitter from the bosses with the word "STUDIO" that was public and retweeting all the houses and even have all the realm numbers that belongs to them with photos from the outside buildings