If you are low on SP, here are some tips on how to get them!

Birthday: on your birthday, you get 1 SP

Buy Them With WFD or real money

Helpful Posts: for every 3 very helpful posts a SP Mod* sees by you, you will get 1 SP

Contests and Prizes: Founders and Admins can give away random amounts, or you can hold a contest and give away your SP

Getting Members: For every 3 members you get to join that post, you get 1 SP! Make sure they include in a post or something that you told them to join.

Drawings: A lot of random drawings will be held. All members that are active are entered, and have a chance to win 1 SP. (these drawings are secret, no one knows about them)

Posting: When you get 1000 posts, you get 1 SP

Admins: Admins can give themselves SP, so they might have a lot just for fun.

There might also be a few other ways.
*SP Mods are hidden, you cannot see them