Yes I do have friends I chat with here, some I've known for years. But as in RL we all have our lives to live, still there's a connection that keeps us connected.
Many a time we keep connected by commenting on each others Posts or at least rating them letting each other know were still around and have read it.
Might I add that it takes effort on both sides to make it work as friends, as in any relationship on or off-line maintaining it is not easy as one would think.
Oh I chat with people here in DM's if they're open to that. Usually first interact on posts, but not always. Sometimes it's just nice to chat about shared experiences without the distractions of 100 other people commenting.
Mostly just post and comment on posts. And I message people sometimes and a few people message me. Occasionally I use Google Chat to chat with a few friends.