Some of the ICO and altcoins must be active so they use the telegram for one of the most communication tool to share their news about the up coming ICO and the market price of the coin which is a good thing because you can now keep updated but sometimes once you get into different groups unexpectedly there is a new group will invited on you and you don't want it and cause of too much spam so it is better if we just have one trusted group that we can change a lot of ideas and knowledge so we keep aware about the market price of the coins.
Having a group in telegram is one of the greatest ideas to share information also I have a group on my local that they are sharing a lot of ideas what are their thoughts about this kind of coins and this is will be working or not also they have a lot of information that helps a newbie to keep aware and avoid those kinds of phishing website and scamming platforms.