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Am I reduced to ASCii art in interim, which doesnt work very well?
It seems theres a restriction on posting images for first month of account, is there a way to get that lifted?

Or you can use a different instance without the cool down period

Is hackertalks a Lemmy or Mastodon instance? Im new to Fediverse so not sure which one is best!

Lemmy only, but its not a public instance, sorry! dubvee.org is really good, and you can upload images as soon as you are registered.

I just signed up for @surg@dubvee.org
Is hackertalks your own private instance? Is it difficult to set up own instance?

not difficult; just requires consistency. The hard parts are upgrades between versions.