[arunarunarun]

Some of this is also a question of "do you want to take the risk of having an indelible black mark in your travel history?"

As an example, the US asks for your travel history (where you went and why) and a list of your social media accounts. It would be trivial to correlate a conference related social media post with a stated reason of tourism and flat that.

They might not do this, but I certainly would not want to jeopardise all future travel for that if.