Maybe there is something that we 're missing which only buyers can see. But it could also be some kind of a "forgotten function" that still exists for those who use it, but in reality, it is of no practical usefulness.
Well it took me 10 minutes to find it so I am not THAT great. Haha.
I couldn't figure out how you actually post to it.
I don't think it matters if you write about things that happened in the past or the future if it has unique news value. I probably wouldn't write about anything beyond a few months ago.
I doubt there are many buyers there, probably even less than the number of buyers who read discussions (we are always told there aren't many buyers in the forums), but it wouldn't be a waste of time to give it a go and see if you have any traction with it if you put together a quick press release..
There is a "Press" tab on your main page of your portfolio. I have done a few to basically use a different way to attract folks here. On an event I shared several years ago, I sent it to some local media and a few put it on their website. A local paper mentioned a new book that I had photographs in based of the local railroad.
I used to work in the media, so relevant press releases are important. Don't send them to media just to announce a new image. Those I share only to social media. But if they are relevant enough, send them to relevant media. You never know when it might hit the right eyes in a news room. Say you are going to display your art at a local arts and crafts fair. They may be planning to do a story on the fair and want to talk to a local artis instead of the organizer. Now they have your contact information. Most if not all media web sites have an e-mail address to submit story ideas.
Make sure the press release is professional. It does not have to look like a New York agency put it together. But it should be in the format they are used to. Here's an example --