There is a "Dismiss" option for each thread. You just need to hover your mouse over on the right -hand corner next to the "Star" in the title box as that will bring up a cog wheel that you can click on that then will bring up the option to "Dismiss" the thread. Now I'm not sure how to bring the dismissed threads back if for whatever reason that you want to look at them.
Edit to say that this only works on the "Announcement" threads in each of the categories.
Comments
Edit to say that this only works on the "Announcement" threads in each of the categories.
http://store.thesims3.com/myWishlist.html?persona=lisasc360
My stories on this site:
https://forums.thesims.com/en_US/discussion/991317/my-sims-stories/p1?new=1