The last online when private thing has always been a thing on SA, but yeah it’s easy to miss if you’re just searching specific people instead of scrolling the feed. However, with SB and SA is take the online thing with a grain of salt. A few people that sent me a message/responded to a message I sent a while ago still showed as offline 3+ days. Not entirely sure how that works but I triple checked and there’s some way around that. I didn’t dig enough to figure it out. SB’s messaging system is also ass - if someone responds it doesn’t jump to the top of your list - you need to find the conversation with them to see their response
even on a big screen only the first 7 or so conversations are displayed and you have to scroll down
through the list to find ones that have responded.
It seems to go in waves- I will do a ton of new messages until the responses fizzle out
and go back to the site in a few weeks later when new people have joined.
So there may be a ton of messages to sift thru.
They also have an auto-expire for the conversations after a certain date - so sometimes an old one
will come back. I end up going to my secret picture approvals to figure out who they are sometimes.