In your own space, post a rec for fannish spaces and resources - comms, challenges, twitters, tumblrs, etc. Tell us about where you hang out. Leave a comment in this post saying you did it. Include a link to your post if you feel comfortable doing so.
This one’s tough for me because I basically hang out on my flist, or more occasionally my Tumblr dash; even when I hang out elsewhere it’s often like, a meta person’s LJ so I can discuss stuff in the comments.
crack_broom: years’ worth of high-quality, tagged Harry Potter recs.
potterfests: given the fest-centric nature of Potter fandom, especially on LJ/DW, this is absolutely necessary and a fantastic resource.
halfamoon: an annual fourteen-day challenge celebrating female characters. It starts TOMORROW and runs until Valentine’s Day! You can create fic or art or icons or vids, or do recs or meta or anything. It’s great.
writingwithcolor: several mods from different backgrounds answer questions about writing BME/POC characters. I found it very helpful when struggling with whether an idea for some original fiction was appropriative - Googling previously having led me to various ideas and articles that were inappropriate or unhelpful for various reasons.
bisexualbooks: my reading fail last year means I’ve still read staggeringly few bisexual characters in my bibliophile life. (Two, both of them ‘hedonistic’.) But this tumblr is a fantastic resource nonetheless.