Fair points. At least with real life politicians you can find out about their past behaviour though, if you do some reading.
On the internet people can just easily lie about who they are. There might be a propagandist on social media who has a strong foreign accent, so in real life you'd know they're from a foreign country, but on the internet you can't hear their accent, so they can easily lie about where they're from.
Also even just for casual interactions on social media (e.g. Reddit), I think one of the reasons that people get so angry in discussions/arguments is because they don't have to see the face of the other person. I guess it's like a dehumanising interaction.
I read this BBC article about it
Obviously if this turns out to be life that would be interesting, but it could turn out to be nothing.
If it turns out to be some moss or bacteria or other basic life, that would be pretty cool. If it's humanoid aliens then maybe we're screwed.