Sponge Brain or Sieve Brain?

My ability to retain information is unpredictable.  I have excellent face-name recall.  I'm awesome at remembering names.  I take great pride in this phenomenon, and therefore I often make a great effort to remember a person's name after the initial introduction to that person (For example, I make up an alliteration for a person's name.  I recently met a woman named "Shantel" or "Chantel".  She's African-American, so I alliterated her name with the word "sugar" from the song "Brown Sugar".  (That song is about an African-American woman.) That helped me for our first few meetings after the initial introduction, and then her face along with her name became branded into my brain).  I have great trouble remembering ideas I come up with for entries for this blog.  When an idea dawns on me, I do all I can to remember that idea (I make up an acronym that I'll easily remember.)  Sometimes, I forget ideas I think I'll easily remember.  The reliability of my memory is inconsistent.