“common keywords”
Nice try, the admonition stands as posted.
Not trying to be cute but "common" as in common to the threads or the theme, and is useful to the [future] search for the [past or other] threads of interest, as opposed to "commonplace" keywords like "election" or "election2016" or "trump" which is pretty useless for search because of high number of irrelevant hits.
... the admonition stands as posted.
Accepted.