I use the great Telegram app to organise our monthly pub meets. Does that make us terrorists. No I think not.
Probably makes you suspect though (not 'a suspect', but suspect - you might be hiding something an attentive officer of the law might get a promotion out of).
Terrorists will use what ever they can find for their crazy keys blow shit up propaganda nonsense.
A truly great definition of 'Terrorist' - for a dope addled surfer-dude.
A terrorist is only a terrorist if you don't agree with their aims/idealogical position/demands - otherwise the label tends to be 'freedom fighter'.