I wouldn't write off @nhlupdate as an invalid source. He has been mentioned of breaking signings before, even by NHL.com. He also doesn't report rumours on that account, so if you don't want any garbage and just want the news, then you can have it. @nhlrumor is an invalid source, but that doesn't mean @nhlupdate is invalid as well. There is only proven news on that account. No reason it is not valid. Just wanted to chime in. Also, I would say another good valid account is Jay Gold, worth following for sure on twitter.