Daily fantasy sports platform FanDuel announced on August 1 a bold new feature that takes on the bigger, more entrenched “season-long” fantasy sports providers. And today that feature goes live to all FanDuel users. The feature is called Friends Mode, and it allows FanDuel users to set up private, recurring leagues to play against friends every week of the season. (The core of the FanDuel product, in the past, was for users to enter large prize pools with strangers.) The format of this is still “daily” fantasy, meaning that every week, users can draft a new team, but by making…