As Bree's universe expands, each new character will have his or her own vlog. Flinders can't write and film them all, so new writer-directors have been hired and paired with actors playing the new characters. Unlike television, where writers sit in a room and come up with a single script, the Lonelygirl15 team comes up with a general plotline and then sends its writer-directors out to produce independent but interconnected videos. All the characters, in essence, have their own show.
That's about the most clever and smartest thing that's happened to mainstream entertainment in a decade.