What actions would make you think a person has something to hide online?

Still-alive
So when talking to someone for awhile what are some things that might give off warning bells in your mind that they are hiding something from you?
What actions would make you think a person has something to hide online?
Updates:
1 mo
I mean online. In person its a bit easier probably
What actions would make you think a person has something to hide online?
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