Learn English – Word for someone who is extremely up-to-date with the latest facts (news or research)

For a status timestamp you might use Updated.

The reason for asking about context is because if the column contained details of what the last activity actually was, it may have been appropriate to use something like Progress.

I used to work alongside such a person. He was okay, and acted friendly enough but there was something about him which made me internally cringe whenever we exchanged words. Perhaps it was his excessive enthusiasm that I found most irritating, in any case I always had an excuse not to join him for a coffee.

There are some people you do not want to be alone with, and not necessarily because you fear for your personal safety but because they are unnerving, and you feel uneasy in their company.

Her unnerving habit of touching people she was speaking to

uneasy: awkward or unsure in manner; uneasy with strangers.