Postings on RootsChat are not normally deleted when completed. They may contain useful information for other searchers.
The quickest way to find your own postings is to click on the "Profile" button at the top of each page, or on your name, wherever you see it, and then, in your profile, click on Show the last posts of this RootsChatter.
Another way is to use the search facility with your name in by user: and any word(s) in search for: that you know you had in your posting.
Good luck, Bob
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Searching for Coleman, Moore, Kallnung in London; Margulies, Remenyi in E. Europe; Ancestors of Hessie Stevenson-Coleman-Baxter (Ireland, 1861) and, of course, any other ancestors for my web-site.