Filter/search for notifications -

Feature - a filter to see mentions by a specific user(s).

Benefit - when a salesperson comes up and asks me if i saw what they tagged me in and i have 138 notifications i can filter for just tags from that sales person.

Feature 2: A search within notifications

Benefit : it would allow me to search for something like "OTD" and quickly pull up all the tags for sales asking for OTD numbers.