A collaborative betting platform is structured around a server (1) in communication with client devices (4) via the Internet (3), the server (1) configured to facilitate specific electronic betting transactions, and more particularly allowing electronic betting selections registered by primary bettors (110) to be conditionally processed on behalf of secondary bettors (120). Such facilitation of electronic betting selections is contingent upon recording a credit note against an account of a secondary bettor (120), which has the effect of reserving funds in the account of the secondary bettor (120). The amount of the credit note is representative of a minimum stake amount which the secondary bettor (120) is requested to commit to bet by accepting a back bet offer based upon a betting selection registered by a primary bettor (110).