Fridays in the NaNoWriMo Facebook Group are not like normal Fridays. No! They turn into a frenzy of likes, comments and self-promotion. The madness that is Self-Promotion Friday.
The idea is simple: every member with an author page, book page or blog page on Facebook can post the link and ask the others to like it.
The others will then leave a comment linking to their own pages (and usually also post a separate status with their link as well), so they can be liked in return.