Hope this helps

My friends here are complaining about the new rule of Ning regarding friendship requests. I am sure you will know why your friendship requests are not being accepted after reading this.

You can only have 50 unaccepted pending friends requests If you put out more after there are 50 standing they do not go through 50 outstanding is the limit and it could be old ning sites you are not even currently a member of if you made friends request as a member and withdrew from the site those request that were not accepted are still pending on your ning account. You need to go to your main ning page account and delete or withdraw all old standing requests that are no longer relevant then your friends requests will start working as it did before you had this problem.

Here is a link to main ning site and then go down and find website ning.com and click on it to go to your main ning account page and then start withdrawing friends requests you will need to figure out how to do that but this info is a good start towards fixing the problem
http://www.crunchbase.com/company/ning