Phone, laptop and tablet.
They are all tied into your social media accounts today.
Ever wondered why if you go looking for an item online you get flooded with social media and e-mail ads for that item for days/weeks?
The latest is the requirement to sign into sites via Google. One NZ news site I read requires a login, but it will not allow me to log in using either of my primary e-mail accounts (family and personal). I can only get in via Google.
The fact is that if you intend, or even think you may someday intend, to visit another country, don’t trash them, or their government, online.
But it is not just blogging. Some countries, despite what the arranging agencies claim, consider house/pet sitting employment and refuse entry on the grounds the traveller does not have a work visa.
And there are other grounds to refuse entry that may have been unenforceable but become enforceable again.