Clarifying Question:
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Considering it is for global users across the world
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Across mobile platforms (ios and android)
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Referring to text messages specifically and not gifs, video or voice calls
Total Messages Sent Per day = Messages sent in Developed world + Developing world + underdeveloped world per day
# of messages sent per day = # of users in every market x average messages sent per user.
World Population 7B, 50% internet penetration → 3.5B
Assuming Whatsapp has 50% penetration in the messaging space → 1.7B users
20% of the world is in developed world, 60% in developing countries, 20% in under developed countries. Assuming the same distribution holds for WhatsApp in these markets
Whatsapp developed user count → 0.2 x 1.7B → 340M users
Whatsapp developed user count → 0.6 x 1.7B → 1B users
Whatsapp developed user count → 0.6 x 1.7B → 340M users
Users in developed countries are reasonable users of WhatsApp but not as strong as developing countries. In general, I would assume 30% of their phone/text conversation happen on whatsapp. Rest happens on iMessage/android SMS, or messenger.
Assuming an average developed country user sends 10 unique messages/day → 3 of them happen on WhatsApp.
Users in developing countries tend to use WhatsApp the most and it accounts for 80% of their conversations. Assuming they send 15 messages per day, 80% of them come on whatsapp → 12 messages.
Users in underdeveloped countries tend to use WhatsApp a lot due to its free nature and it accounts for 80% of their conversations. Assuming they send 5 messages per day, 80% of them come on whatsapp → 4 messages.
Total Messages Sent --> Messages sent in Developed world + Developing world + underdeveloped world per day
→ (340M x 3) + (12x1B) + (340M x 4)
→ 14.4B messages are sent per day on whatsapp