How would you know if the person you are talking to in here is fake or not?

Instinct. Sometimes you really feel that they are real.

When they're not though. Smh.

Breaks your trust a little more.

Mostly their profile says a lot about them. and other times, i go with my intuition.

Hard to type with plastic fingers

Take time to get to know someone. Pay attention. This is if you want to build something with them.
But otherwise, does it matter if they are real or unreal? Enjoy what they have to offer, no strings attached.

Experience..

Their pictures? Reverse Google image search if you want.

Personality isn't as easy to figure out though.

Gamble. I personally take nothing too seriously here. Im here for my own entertainment and assume others are as well.

ask intelligent questions of them

Assume everyone is fake and your more than 80% correct, although 100% are real people.