This also has the added benefit of stopping those people who join your forum to post "helpful links" that happen to point to their own sites. I'd recommend you consider adding https://* to the filer as well. I only rated it good because you can also do this with user promotions. Just add new users to a group that can't post links until they hit x amount of posts then promote them to full members.
I prefer this way to groups because you don't have to wait for the cron to update members, and blocking links via group doesn't affect anything other than posts (I think).