Liquid can be dropped in the nose or eyes for a faster, cleaner trip.
As Cosmic Giraffe said, dropping liquid LSD into the nose does indeed sound very awkward, very uncomfortable and quite pointless. I never heard of any one doing it. Maybe Nexus_hipster Has it confused with NBOMe's? they are sometimes insufflated in liquid form.
What ever you do,
DO NOT drop liquid LSD into your eyes, that is the worst piece of advice ever. Sure it's possible, but it's quite dangerous because you don't know what other chemicals are in there, or what bacteria is growing in your liquid LSD. I know a couple of people who took acid this way and they are fine, but that doesn't mean it's safe. You could get an eye infection, or worst case, damage your eyesight.
https://www.erowid.org/ask/ask.php?ID=1769
https://www.erowid.org/experiences/exp.php?ID=50110
Also, MOA doesn't effect how "clean" a LSD trip feels, thats complete nonsense.
The normal method of administration for liquid LSD is to place a drop on your hand and lick it off (this way you have good control of how big the drop gets. Also the skin between the thumb and the index finger makes a nice shallow groove to catch the drop) Of cause, there might be local variations of how to do this.
It's obviously also possible to measure your liquid LSD dose very precise with an oral syringe, and put it in a larger quantity of liquid for drinking.
There's really no advantage of blotters over liquid or vice versa, imo. it's a question of preference really.