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We are not fund terrorism or sell drugs in Telegram, we just communicate here, i do not see any problems. I hold BTC in telegram bots, use 2fa and cloud password, and don't worry about this.

you can use the BBM , it is the best messenger app
http://www.bbm.com/bbm/en.html

That's partly true. Telegram uses phone number for registration. You can set up additional authentication factors as I adviced in my article. Set up a password for example and your security rises dramatically.

That doesn't stops bad guys to send messages on your behalf.

You have to nock'em out first to stop'em

Agreed. Better use a messenger like Threema, which doesn't require you to provide a phone number. Also, Telegram's encryption is considered questionable among experts.

It is cross platform? Can I exchange BTC to RUB or USD there?

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