Ability to clear individual @mentions in @mentionfeed

Use case: When I am looking at my @mention feed, I am forced to see all my @mentions, including ones that I've already addressed. Then I have to comb through to find the ones I actually need to take action on.

Possible solve: Allow me to X out or say "read" for each, and those would disappear from that feed. Then there could be a second view of that feed that includes all - you could toggle between "Action Needed" and "All."