At the time being, only asylums and journals on IJ get listed. I might include other sites and del.icio.us accounts some day, but don't count on it.
The journals and asylums can be multifandom or fandom-specific, open for all or a personal community where only one or two users have posting access. They must focus on recs -- for example, a personal journal where recs are posted alongside with other content won't qualify.
If your recs feature certain themes -- e.g. you like to read and rec lots of crossovers / focus on femslash / include BDSM / ... -- it would be nice to explain it on your profile page or in the comment, so I can mention it in the index entry and tag accordingly. :)