popularity

I recently checked out the book "UNIX Network Programming, Vol. 1" by Richards Stevens and I found that there is a third transport layer standard besides TCP and UDP: SCTP . Summary: SCTP is a transport-level protocol that is message-driven like UDP, but reliable like TCP. Here is a short introduction from IBM DeveloperWorks . Honestly, I have never heard of SCTP before. I can't remember reading about it in any networking books or hearing about it in classes I had taken. Reading other stackoverflow questions that mentions SCTP suggests that I'm not alone with this lack of knowledge. Why is

I have a Django application in which I need to implement a simple trending/ranking algorithm. I'm very lost as a : I have two models, Book and Reader . Every night, new books are added to my database. The number of readers for each book are updated too every night i.e. One book will have multiple reader statistic records (one record for each day). Over a given period (past week, past month or past year), I would like to list the most popular books, what algorithm should I use for this? The popularity doesn't need to be realtime in any way because the reader count for each book is only updated

I'm making a digg-like website that is going to have a homepage with different categories. I want to display the most popular submissions. Our rating system is simply "likes", like "I like this" and whatnot. We basically want to display the submissions with the highest number of "likes" per time. We want to have three categories: all-time popularity, last week, and last day. Does anybody know of a way to help? I have no idea how to go about doing this and making it efficient. I thought that we could use some sort of cron-job to run every 10 minutes and pull in the number of likes per the last