Speaking of circles, one has to wonder about the management at Friendster. They recently fired an employee for, apparently, blogging (see this site for additional links) that they had switched from JSP to PHP. If this is true, and I don't have any reason to doubt it, you have to wonder what closet they keep their brains in because they surely aren't walking around with them.
Even if you take it at face value, it's not like you can't tell they've switched to PHP since the extensions on their pages changed. So if a cluefull person knows of the change, can you still claim it is a trade secret? I...don't...think...so.
In any case, if you are a member of Friendster, you may want to re-evaluate your use of that service and take a look at one of their competitors (see this site that lists a few alternatives).
Aloha!
