I don"t think so they are to hard to be gall stones! My husband had gall stones and they are not like these! I broke one open and they are like stone in the center! They are really hard to break! My grandson helped clean out an old house and there was a box of these stones! These are real heavy like stone!
*info on fan limit.... http://www.listia.com/support/topic/fans "There is a limit on the number of users you can become a fan of. You are allowed to become a fan of 1000 users, but after that the ratio of your fans to users you fan has to be greater than 90%. If you do not meet this requirement you will not be able to fan any more users until you increase your ratio."
I go through the people I am a fan of every now and then, usually oldest first, & remove being a fan if they aren't active (ie: have not logged in for 2 months etc)