If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Notes for future OT posters:
1. Please add the 'open_thread' tag.
2. Check if there is an active Open Thread before posting a new one. (Immediately before; refresh the list-of-threads page before posting.)
3. Open Threads should be posted in Discussion, and not Main.
4. Open Threads should start on Monday, and end on Sunday.
I agree that adding content to Wikipedia is worthwhile.
In addition to Wikipedia I think that StackExchange pages can often be very worthwhile.
Often when I come across an interesting claim on the internet where I don't know whether it's true, I post it on Skeptics.StackExchange or a subject specific site in the StackExchange network.