which is the most famous and fast application used by humans to communiucate ? which is most used application after facebook?

Dani AI

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Good question, — and thanks to @M, and for the quick suggestions. Two separate goals need different answers: "fast" (technical performance) and "most used" (popularity). To test speed in a repeatable way, measure message round‑trip latency, delivery success rate, notification delay, and attachment throughput. Simple test plan: use two identical devices, log client send/receive timestamps, send a fixed mix of small texts and larger files over both Wi‑Fi and cellular, record round‑trip times, and report median and 95th‑percentile values. Run a push‑notification–only test (app backgrounded) because notifications often add the biggest delay. Use ping/traceroute plus server logs to separate network from app processing time.

If popularity is the main concern, global market reports show WhatsApp is the largest messaging platform while regional leaders differ (WeChat dominates China; iMessage and Messenger are important in the U.S.). For up‑to‑date global and country‑level figures consult the DataReportal Digital 2025 Statshot. (datareportal.com) Recent news on U.S. growth (100 million monthly users) is here: The Verge, July 25, 2024. (theverge.com)

Choice depends on the use case: consumer chat requires the app most contacts already use; business messaging should weigh API features and delivery guarantees; low‑latency real‑time systems need the controlled tests above so "fast" can be compared objectively to "popular."

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ummm.... twitter and skype are pretty well known.

I've heard of this hotmail and gmail too, from time to time.
or facebook. take your pick, there are millions "out there"
EDIT: any forum, even this one, is communication.
but the most used is talking to each other or sending SMS.

As per my way facebook and twitter are the best communicating applications.

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