There is no rule against adding "memory" content to the profile text (when in doubt, stick it in Research Notes) or in a profile message. Because theres no signature on content we put in profiles, when we add personal notes to profile text, we should sign the notes (either enter the wiki-link on your profile, or use 4 tildes ~~~~ to insert an dated signature, then go back and edit it to display your name instead of your profile ID).
My personal pet peeve about "Memories" has to do with profiles where someone has used the Memories box to enter a novella-length biography, a 10-generation pedigree of the member's family, or a list of sources.