[jand]

"support or engage in terrorist or violent extremist offences"

What constitutes "support"? Hopefully your next government is OK with you back then liking the post of that one organization previously not classified as terroristic.

[concordDance]

I wonder if arguing against someone who says "Group X eats babies with kitten sauce!" would count as supporting Group X...

[exe34]

At the very least you're connected via metadata, so Project Insight will still be interested in you.

[sorushn]

The Holy Land Foundation case comes to mind.