The Nets didn't give up a first rounder this past season, for two reasons: 1) they didn't do any big trades that would require the inclusion of a pick, and 2) they basically had none left to give.
They were, however, very active in dealing second rounders Starting on Draft Night last June and going through July, they added five second rounders, three on Draft Night, then two in the Jason Kidd trade compensation package. Then, during the season, they agreed to swap one and traded one, both to Philadelphia in return for the Sixers taking on players.