If you wish to find a decent raplcement for Skype of Telegram, Discord is probably the best choice on today's market.
A Multi-Purpose Chat Tool
The primary function of Discord is, naturally, communication. You can set up your own server and make VoIP calls to other users, create one-on-one chats or entire conferences for any kind of purpose, be it social discussion or a raid in an MMORPG. Customize connection settings to optimize the loading of video, audio or shared files in the cloud.
A Social Hub
Another thing that appeals to me about Discord is the fact that it can replace virtually any social media you have. it has the chatting and newsfeed functionality of Facebook, video streaming options like twitch or YouTube. the only thing it's lacking is the social rating system, which will be coming evewntually, I'm sure.
Discord has a long way ahead of it. It's still not as prominent as its older alternatives, but the potential and the already jack-off-all-trades nature of the app speak for themselves.