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Telegram
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Telegram is a cloud-based mobile and desktop messaging app |
Terms of Service & Privacy Policy
https://core.telegram.org/api/terms-of-use
There are no specific TOS:
"In case you want a real Terms of Use, complete with lawyer-speak and all — we don't have that yet, sorry. But we may be adding it in the future".
Privacy: https://telegram.org/privacy
API interface TOS: https://core.telegram.org/api/terms-of-use
Evaluation
(03.02.2017)
End to End ecryption is possible
Versatile; Group discussions,Bots, Channels, Multimedia, File Transfer to 1,5Gt
Open (mainly) Source (at least APIs)
Auditing possilbe for Third Party
Good documentation (esp. for Security Features)
Compatible with other messaging apps, for example Slack and Irc
Account can be removed by user (all data will be removed)
Unused account will be deleted after 6 months afer last login, all data will be removed
Data is stored to Cloud
Phone app is mandatory to install
Encryption is not on by default
Uses own encryption protocol MTProto Mobile Protocol https://core.telegram.org/mtproto/description (which is well descripted ) but only some of Telegam´s clients uses it
Login
Logging is done by full (international) phone number and password while installing Telegam Client. Account is verified by SMS.
Support
No TOS no full support
Provider
Telegram Org (Pavel and Nikolai Durov).
Revenue
Pavel Durov is financing Telegram for ideological reasons.
Similar services
Signal, WhatsApp