I have a couple (online) friends who can reflect back at me if I'm getting weird. I also have learned a LOT about detecting hypo early since we found meds that reduce my depression but cause me to go hypo more often on balance.

I'm highly active on social media but it's tumblr and then some weird anti-establishment networks most people haven't heard of. Facebook and Twitter are both god-awful no matter what mood one is in. I tend to get more rambly and disclose more at times online when hypo, of course, but I manage the distinction between my irl identity and my online identities very well, so it's rare that I post something I really regret in context of who sees it. I'm fairly open on tumblr because there I feel like I can be an ambassador for the bipolar community both to other bipolar people and normies. I would not do this on Facebook or Twitter.