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brilliant idea. Would you help me out of this? giving some suggestions if possible.

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The best trick is to try a lot of place names. Nearby cities and suburbs work well.
https://steemit.com/trending/brazil
Just replace 'Brazil' with any local town or city, and keep trying different options until you find somebody posting nearby. Reach out to them, and go have a beer together.
Here in Adelaide we came up with a nickname for our group, which we use as a tag/topic. #mallsballers, which is named after some big, shiny balls in our city's main shopping area.
If you start promoting that as the local tag, then you can find and support each other much easier, online and off.