Home: Products: Plugins: Gossamer Links Plugins: Paid Plugins: 2.2.x Version: Limit_Links_Add_Pro
The idea behind this plugin, is that you can limit how many links a user can add. If they go over this limit, then they are shown a custom error page. Not a lot of money for this plugin, but the idea behind it should save you hours of work if someone decides to try and SPAM you....
This "PRO" version lets you limit people even more. Example, 1 link every 7 days; or 5 links every 30 days, etc. VERY handy for adult sites, where you get a lot of spam submissions.