Introducing myself

I just starting posting now that I am retired, but I have read posts here for a long time. Doing so got me through some frustrating political times, so I thank all posters for that. My last 20+ years of work was as legislative work with the last 11 years in the Democratic minority.
I will now try to contribute to the discussions.

Question: If I find an interesting link that I would like to post, is there an easy way to determine if it has already been posted?