Wishpond follows Facebook's policy regarding the usage of Facebook's Like and Share buttons.
Facebook and its licensors reserve all right, title and interest, including all intellectual property and other proprietary rights, in and to all SDKs. Due to Clause 14 of Facebook's social plugin policy, Facebook like, shares, follows, and etc are not available as bonus entry options within leaderboard contest or the bonus entry sweepstake contest. However, regular buttons that do not incentivizes users are permitted to be used within the contest. Please refer to this link from Facebook for more information.
To add any bonus entry buttons that are not provided within Wishpond platform by default, please refer to this article.