I don't know who this guy Yossi Gestetner is, AFAIK I never appointed him to represent me. And it's a safe bet to say that he doesn't represent the klal.
I know him but am not affiliated with him.
He doesn't claim to represent the klal with all his tweets from his personal account, it is his opinions on national politics, markets etc. that you may or may not agree with just like any other guy on Twitter.
He has helped the klal numerous times through many different means, including calling out local reporters (on Twitter usually through a different account, plus he has contacts with literally hundreds of reporters and reaches out directly) and having dozens of stories corrected. If you don't agree with his message, you don't need to support him.
ETA: Do you remember when any Orthodox Jew was arrested for any reason, all the headlines were "Orthodox Rabbi arrested"? Thanks to Gestetner, that doesn't happen anymore unless it is actually a real Rabbi and it's relevant to the story.