I don’t think there’s a serious or an existing telegram group for bitcoin,
their is so many scam investments group in telegram, where the scammers will ask to invest $500 to earn $1500 and invest $1000 and earn $3000, all those things are scam, but you when you are not informed and such information come contact to you, you will hopefully think it's real. So we have to be careful of scammers because such investment on social media you can't find your business partner when you enters into trouble.
I have never heard of such before. Moreover, you have to be watchful and careful of the kind of telegram group you join for bitcoin or any other cryptocurrency because all these telegram groups and other social media group are full of scams whereby they lure different people into investing their money on what doesn’t exist. Scams are everywhere, do not join anyhow or any form of strange group. I believe that this forum is informative and comprehensive enough for us to get whatever information we are looking for regarding bitcoin and other cryptocurrencies.
Some newbies have to learn from the scam accusation board to know that their is scam everywhere, this scammers is easily catch the newbies for their investment, and mostly it's lacks of information of scammers or awareness of scammers to new investors that lure people into social media investment. Do you know that without some people being in the forum and share the experience of scammers many people would have be victim to it. To stop scammers to scam people through social media will be hard, but the only remedy is to pass the information of scammers in local environment including the in online.