I'm not personally too big on posting leaving/intro threads. If I'm having some simple computer issues for a little bit, I just drop a note somewhere my friends will see, so usually on Tumblr/Facebook/Deviantart. I don't think the rest of the FH community is really too concerned I'll be inactive for a few weeks, it's really just important that people I talk to on a daily basis are aware.
I only post leaving threads if I'm definitely going to be gone for a few months at least. Feralheart isn't too much of a worry, since I wouldn't really consider myself an active player (I just like stalking the forums), but if I ever need to take a 'mental health break' from any other websites, I just do it quietly. Move the bookmark into a folder so I don't impulsively click on it, and just log out of certain social media or programs for a bit. If I ever make a leaving post impulsively, I just get all curious who posts on it and what they say and it just prevents me from leaving fully.